Межевой план уже готов.

Межевой план is a technical/legal term, not just a general plan.

• план = plan
• межевой comes from межа, an old word meaning boundary or border line

So межевой план is a boundary plan, land-boundary plan, or cadastral boundary document used in land registration and surveying contexts.

A learner might expect something more general, but this phrase sounds administrative and property-related.

In Russian, the verb to be is normally not expressed in the present tense.

So:

• Межевой план уже готов. literally looks like:
• Boundary plan already ready.

But in natural English, that becomes:

• The boundary plan is already ready.

This is completely normal in Russian. Compare:

• Он дома. = He is at home.
• Документ готов. = The document is ready.

If you want past or future, then forms of быть appear:

• Межевой план был готов. = The boundary plan was ready.
• Межевой план будет готов. = The boundary plan will be ready.

Готов is the short form of the adjective готовый.

Russian has two adjective forms in cases like this:

• long form: готовый
• short form: готов

The short form is commonly used when the adjective is the main predicate of the sentence, especially for states or conditions:

• План готов. = The plan is ready.

The long form usually appears when the adjective directly modifies a noun:

• готовый план = a ready / finished plan

So in this sentence, готов is used because the meaning is the plan is ready, not the ready plan.

Because it agrees with план, which is:

• masculine
• singular

Short-form adjectives change for gender and number:

• masculine: готов
• feminine: готова
• neuter: готово
• plural: готовы

Examples:

• План готов. = The plan is ready.
• Карта готова. = The map is ready.
• Письмо готово. = The letter is ready.
• Документы готовы. = The documents are ready.

Since план is masculine singular, готов is the correct form.

It is in the nominative case.

That is because межевой план is the subject of the sentence:

• Межевой план = the thing being talked about
• готов = describes its state

So the structure is basically:

• [subject in nominative] + [predicate adjective]

That is why you see:

• межевой — masculine singular nominative
• план — masculine singular nominative

Уже means already.

So:

• Межевой план уже готов. = The boundary plan is already ready.

Its position is quite natural here, between the subject and the predicate. But Russian word order is flexible, and moving уже can slightly change emphasis:

• Межевой план уже готов.
  Neutral: the plan is already ready.

• Уже межевой план готов.
  More marked; this sounds more contrastive or context-dependent.

• Межевой план готов уже.
  Possible in speech, often with special emphasis.

For a learner, the given version is the safest and most neutral.

Because межевой is an adjective agreeing with план.

Since план is:

• masculine
• singular
• nominative

the adjective also has to be:

• masculine
• singular
• nominative

That gives межевой.

This is just normal adjective-noun agreement in Russian:

• новый план = new plan
• подробный план = detailed plan
• межевой план = boundary plan

So межевой is the correct dictionary-style form here for a masculine singular noun in the nominative.

The stress is:

• межево́й
• план
• уже́
• гото́в

A rough pronunciation guide:

• межево́й ≈ mee-zhih-VOY
• план ≈ plahn
• уже́ ≈ oo-ZHE
• гото́в ≈ gah-TOV

So the whole sentence sounds roughly like:

mee-zhih-VOY plahn oo-ZHE gah-TOV

A couple of useful notes:

• unstressed о is often reduced in pronunciation
• ж sounds like the s in measure

Russian has no articles like the or a/an.

So план can mean:

• a plan
• the plan

Which one is intended depends on context.

In this sentence, English will usually choose the if both speakers know which plan they mean:

• The boundary plan is already ready.

But in another context, it could be:

• A boundary plan is already ready.

Russian leaves that to context instead of marking it with articles.

It sounds somewhat technical or bureaucratic because of межевой план.

The grammar itself is completely normal, but the noun phrase belongs to official language about:

• land surveying
• real estate
• cadastral registration
• property boundaries

A more everyday sentence with the same grammar pattern would be:

• Документ уже готов. = The document is already ready.
• Отчёт уже готов. = The report is already ready.

So the sentence structure is very common, even if the vocabulary is specialized.