Die waardasie is gereed.

Yes. Die is the Afrikaans definite article, so here it means the.

A few useful points:

• die is used for the in both singular and plural.
• Afrikaans does not have grammatical gender like German or French, so you do not need different words for masculine, feminine, or neuter nouns.
• If you wanted a valuation, you would use 'n instead: 'n waardasie.

So:

• Die waardasie = the valuation
• 'n waardasie = a valuation

Waardasie usually means valuation, appraisal, or sometimes assessment, depending on context.

It is often used in formal or professional situations, for example:

• property valuation
• business valuation
• insurance appraisal
• official assessment of value

So in this sentence, it most naturally means something like the valuation/appraisal.

This is the normal word order for a simple Afrikaans main clause:

• Die waardasie = subject
• is = verb
• gereed = complement/adjective

So it follows the basic pattern:

Subject + verb + complement

That is very similar to English:

• The valuation is ready.

A useful comparison:

• Statement: Die waardasie is gereed.
• Yes/no question: Is die waardasie gereed?

And in a subordinate clause, the verb typically moves to the end:

• Ek weet dat die waardasie gereed is.
  = I know that the valuation is ready.

Is is the present-tense form of the verb wees (to be) used in this kind of sentence.

A very helpful thing for English speakers is that Afrikaans verbs usually change much less than English verbs. With is, you get:

• ek is = I am
• jy is = you are
• hy/sy/dit is = he/she/it is
• ons is = we are
• julle is = you are
• hulle is = they are

So even if the subject changes, is stays is.

Because gereed comes after the verb is and functions as a predicate adjective.

In Afrikaans, adjectives used after a linking verb like is usually stay in their basic form:

• Die kos is warm.
• Die huis is groot.
• Die waardasie is gereed.

That is why you see gereed here, unchanged.

Usually gereed means ready, prepared, or completed enough to be used or delivered.

In this sentence, the most natural English idea is:

• The valuation is ready.

Depending on context, that can imply:

• it has been completed
• it is available
• it is prepared for review or delivery

So gereed often overlaps with finished, but ready is usually the best first translation here.

Yes, you often could, but the nuance is slightly different.

• gereed = ready, prepared
• klaar = finished, done

So:

• Die waardasie is gereed.
  suggests the valuation is ready for use, collection, review, etc.
• Die waardasie is klaar.
  emphasizes that the work is finished.

In many everyday situations, people may use both, but gereed is a good choice if the focus is on readiness.

For a yes/no question, Afrikaans usually puts the verb first:

• Is die waardasie gereed?

That means:

• Is the valuation ready?

This verb-first pattern is very common in Afrikaans yes/no questions.

You use the Afrikaans double negative:

• Die waardasie is nie gereed nie.

This literally contains two nie words, which is normal in standard Afrikaans.

Pattern:

• subject + verb + nie + rest + nie

So:

• Die waardasie is gereed. = The valuation is ready.
• Die waardasie is nie gereed nie. = The valuation is not ready.

A rough English-friendly pronunciation is:

• Die ≈ dee
• waardasie ≈ vaar-DAA-see
• is ≈ iss
• gereed ≈ khuh-REET (with a guttural g, not an English g)

So the whole sentence is roughly:

dee vaar-DAA-see iss khuh-REET

A few notes:

• The g in Afrikaans is usually a throat sound, not the English g in go.
• English-style spellings are only approximations, but this should help you recognize the sentence when you hear it.

Then waardasie becomes waardasies:

• Die waardasies is gereed.
  = The valuations are ready.

Notice something important: the verb still stays is.

That is a useful Afrikaans pattern for learners, because the verb does not change the way English is/are does.