In die aand kyk ons televisie wanneer die werk klaar is.

Yes. In die aand is a very normal, idiomatic way to say in the evening in Afrikaans.

• in = in
• die = the
• aand = evening

So literally it is in the evening.

Afrikaans also has saans, which often means in the evenings or at night in a more general or habitual sense. So In die aand kyk ons televisie and Saans kyk ons televisie can both work, but in die aand sounds a bit more like a specific time period, while saans often sounds more habitual.

Because Afrikaans uses verb-second word order in main clauses.

The basic order is:

Ons kyk televisie.
= We watch television.

But when another element comes first, such as a time phrase like In die aand, the finite verb must still stay in the second position:

In die aand kyk ons televisie.

So:

• first position: In die aand
• second position: kyk
• then the subject: ons

This is very common in Afrikaans and also happens in Dutch and German.

No. In Afrikaans, verbs usually do not change for person or number in the present tense.

So you get:

• ek kyk
• jy kyk
• hy kyk
• ons kyk
• hulle kyk

That is much simpler than English. So kyk stays kyk whether the subject is I, you, he, or we.

That is a very common question.

Afrikaans uses:

• kyk na = look at
• televisie kyk = watch television

So:

• Ek kyk na die hond. = I look at the dog.
• Ek kyk televisie. = I watch television.

When the meaning is watch TV, Afrikaans normally does not use na. It is treated more like an activity.

Because televisie here means the activity or medium of television/TV, not a specific television set.

So:

• televisie kyk = watch television / watch TV
• die televisie = the television set

Compare:

• Ons kyk televisie. = We watch TV.
• Die televisie is nuut. = The television is new.

So in your sentence, televisie is not a specific object with the; it is the general activity.

Wanneer means when. It introduces a time clause.

In this sentence, wanneer die werk klaar is means something like:

• when the work is finished
• once the work is done

Depending on context, wanneer can also have a more general sense like whenever. In a sentence describing a habit, that broader sense can sometimes be felt.

Because wanneer introduces a subordinate clause, and in Afrikaans subordinate clauses the finite verb usually goes to the end.

Compare:

Main clause: Die werk is klaar.
= The work is finished.

Subordinate clause: wanneer die werk klaar is
= when the work is finished

So the verb is moves to the end because of the subordinate clause structure.

Klaar means finished, done, or ready, depending on context.

In die werk klaar is, it means the work is finished or the work is done.

It is not the main verb here. The main verb in that clause is is.
So the structure is:

• die werk = the work
• klaar = finished/done
• is = is

Together: the work is finished

Die werk usually refers to the work as a specific thing that needs to be completed.

So here it sounds like:

• the work that has to be done
• the task/job at hand

If you just say werk, that often means work in a more general sense, like employment or work as an activity.

Compare:

• Ek het werk. = I have work. / I have a job. / I have work to do.
• Die werk is klaar. = The work is finished.

So die werk is more specific.

It can suggest either, depending on context, but it often sounds like a general habit:

In die aand kyk ons televisie wanneer die werk klaar is.
= In the evening, we watch TV when the work is finished.

Because there is no special marker for one single evening, many learners will hear this as something habitual or typical.

If you wanted to make a single occasion clearer, context would usually do that, or you could add a more specific time expression.

Yes, it is natural and correct.

A native speaker might also say similar things such as:

• Saans kyk ons televisie wanneer die werk klaar is.
• Ons kyk in die aand televisie wanneer die werk klaar is.
• Ons kyk televisie as die werk klaar is.

The version you have is perfectly fine. It is a good example of:

• a fronted time phrase
• normal verb-second order in the main clause
• a subordinate clause with the verb at the end

So it is a very useful sentence for learning Afrikaans word order.