Om det så er metroen eller bussen, kommer hun til universitetet til tiden.

Yes, om often means about, but not here.

In this sentence, om means whether:

• Om det så er metroen eller bussen ... = Whether it’s the metro or the bus ...

This is a very common Danish use of om in clauses that present alternatives.

Here, det så er is part of an idiomatic expression.

• det er = it is
• så does not mean so in the ordinary English sense here

In this pattern, så adds emphasis and gives the clause a concessive flavor, something like:

• whether it be
• whether it’s
• even if it’s

So om det så er metroen eller bussen means something like:

• whether it’s the metro or the bus
• be it the metro or the bus

The important thing is that the choice does not affect the result.

Because Danish often uses the definite form when talking about means of transport as recognizable options:

• metroen = the metro
• bussen = the bus

In English, we might sometimes say by metro or by bus without an article, but Danish often prefers the definite noun in these contexts.

Here it also fits the structure it is the metro or the bus: the sentence is naming two specific transport options.

Because the grammatical subject is det, not metroen eller bussen.

The structure is:

• det = subject
• er = verb
• metroen eller bussen = subject complement

So Danish uses singular er because det is singular.

Also, eller presents alternatives one at a time: the metro or the bus, not both together.

This is because Danish is a V2 language in main clauses: the finite verb normally comes in the second position.

The sentence begins with a fronted subordinate clause:

• Om det så er metroen eller bussen, ...

After that, the main clause must place the verb before the subject:

• ... kommer hun til universitetet til tiden

So:

• Hun kommer til universitetet til tiden. = normal order
• Om det så er metroen eller bussen, kommer hun til universitetet til tiden. = verb comes before hun because something else is in first position

This is one of the most important Danish word-order patterns to learn.

Because til expresses movement toward a destination.

• komme til universitetet = get to / come to the university
• være på universitetet = be at the university

So:

• Hun kommer til universitetet = she arrives there
• Hun er på universitetet = she is there

English often uses to for movement and at for location; Danish works similarly here.

Because these are two completely different expressions:

• til universitetet = to the university
• til tiden = on time

The first til is a normal preposition of direction. The second til is part of the fixed phrase til tiden.

So even though the same word appears twice, it is not redundant or strange in Danish.

This is a very common learner question.

• til tiden = on time, at the expected/scheduled time
• i tide = in time, before it is too late

Examples:

• Hun kom til tiden. = She arrived on time.
• Hun kom i tide til at nå toget. = She arrived in time to catch the train.

In your sentence, til tiden is correct because the idea is that she reaches the university punctually.

No. That is a different construction.

There are two patterns:

1. komme til + place

   • Hun kommer til universitetet.
   • She gets to the university.

2. komme til at + infinitive

   • Hun kommer til at glemme det.
   • She will/end up forgetting it.

In your sentence, til universitetet is just a place phrase. It has nothing to do with the future-like kommer til at construction.

Yes, it is natural, though it can sound a bit more emphatic or slightly more formal/stylized than the plainest possible wording.

It is used when the speaker wants to say that the alternative does not matter:

• Om det så er metroen eller bussen, kommer hun til universitetet til tiden.

The sense is: No matter which of those two it is, the result is the same.

A more neutral alternative could be:

• Uanset om det er metroen eller bussen, kommer hun til universitetet til tiden.

Both are natural, but om det så er ... has a stronger rhetorical feel.

Not very well. A literal translation would sound awkward.

Danish:

• Om det så er metroen eller bussen ...

A natural English rendering would be:

• Whether it’s the metro or the bus ...
• Be it the metro or the bus ...
• No matter whether it’s the metro or the bus ...

So this is a good example of a structure you should learn as a whole expression rather than translating piece by piece.

The comma marks the end of the fronted subordinate clause:

• Om det så er metroen eller bussen, = subordinate clause
• kommer hun til universitetet til tiden. = main clause

It helps show the sentence structure clearly. When a subordinate clause comes first, you will very often see a comma before the main clause begins.

Yes, but then the structure and emphasis would change.

For example:

• Hun kommer til universitetet til tiden, om det så er metroen eller bussen.

That is possible, but it sounds different. Starting with Om det så er ... puts immediate focus on the alternative means of transport and sets up the contrast first.

So the original version emphasizes: regardless of which one it is, she still arrives on time.