Временное удостоверение уже готово.

Because удостоверение is a neuter singular noun, and the adjective временное has to agree with it.

In Russian, adjectives match the noun in:

• gender
• number
• case

So here:

• удостоверение = neuter, singular, nominative
• временное = neuter, singular, nominative to match it

Compare:

• временный паспорт = temporary passport (masculine)
• временная справка = temporary certificate/note (feminine)
• временное удостоверение = temporary ID/document (neuter)

Because готово is the short form of the adjective готовый.

Russian often uses the short form of adjectives after a noun to mean something like:

• is ready
• is complete
• is available

So:

• удостоверение готово = the document is ready

If you said готовое удостоверение, that would usually mean a ready/completed document as part of a noun phrase, not as the main statement of the sentence.

Compare:

• Удостоверение готово. = The ID/document is ready.
• Готовое удостоверение лежит на столе. = The ready/completed ID is lying on the table.

In the present tense, Russian usually omits the verb to be.

So:

• Временное удостоверение уже готово. literally looks like
• Temporary ID already ready.

But it naturally means:

• The temporary ID is already ready.

This is completely normal in Russian.
If you want past or future, then forms of to be appear more clearly through other verbs:

• было готово = was ready
• будет готово = will be ready

It is in the nominative case.

Why? Because it is the subject of the sentence:

• Временное удостоверение = the temporary ID/document
• уже готово = is already ready

So the structure is basically:

• subject + adverb + short-form adjective

No other case is needed here because the sentence is simply describing the subject.

Удостоверение is a document that certifies identity or status. Depending on context, it can be translated as:

• ID
• identification document
• certificate
• permit/document

In this sentence, временное удостоверение often means something like a temporary ID document or temporary certificate issued while a permanent document is not yet ready.

So the exact English translation depends on the real-life situation, but the Russian wording is very natural.

Уже means already.

It shows that the speaker is emphasizing that the document is ready now, perhaps earlier than expected or in contrast to before.

So:

• Временное удостоверение готово. = The temporary ID is ready.
• Временное удостоверение уже готово. = The temporary ID is already ready.

The second one often implies:

• you can come get it now
• it has become ready
• it is no longer pending

Yes, Russian word order is fairly flexible, but the emphasis changes.

The neutral order here is:

• Временное удостоверение уже готово.

Other possible orders:

• Уже готово временное удостоверение.
• Временное удостоверение готово уже.

These are possible, but they sound more marked or context-dependent.
For a learner, the original order is the safest and most natural in ordinary speech.

A rough guide:

• Временное удостоверение уже готово. = neutral statement
• Уже готово временное удостоверение. = emphasizes already ready
• Временное удостоверение готово уже. = can sound conversational or contrastive

The stress is:

• време́нное
• удостовере́ние
• уже́
• гото́во

A rough pronunciation guide:

• vrye-MYEN-na-ye oo-da-sta-vye-RYE-ni-ye oo-ZHE ga-TO-va

A few helpful notes:

• временное is pronounced with a doubled нн, but you do not need to exaggerate it too much.
• удостоверение is long, so it helps to break it into parts: у-до-сто-ве-ре-ни-е
• готово ends with -во, not -воh

You could do that word-for-word to understand the structure, but it is not natural English.

Natural English would be:

• The temporary ID is already ready.
• Your temporary ID is already ready.
• The temporary certificate is already ready.

Which English version is best depends on context. Russian often leaves out things that English prefers to make explicit, such as the or your.

It can be used for both, but the form changes to match the gender/number.

For people:

• Я готов. = I am ready. (male speaker)
• Я готова. = I am ready. (female speaker)

For things:

• Письмо готово. = The letter is ready.
• Удостоверение готово. = The ID/document is ready.

So готово is the neuter singular short form, which matches удостоверение.

Yes, very often.

In real life, especially in service situations, people commonly say:

• Ваше временное удостоверение уже готово. = Your temporary ID is already ready.

The sentence without ваше is still perfectly correct. It just sounds a little more general or depends on context. For example, if everyone already knows which document is being discussed, Временное удостоверение уже готово is enough.