A biometria está pronta, de modo que posso continuar.

In Brazilian Portuguese, biometria usually refers to a biometric check, scan, or registration, depending on the situation.

So here it does not necessarily mean the abstract concept of biometrics in general. It more likely means something like:

• the biometric verification
• the fingerprint/face scan
• the biometric registration step

The exact English wording depends on context.

Portuguese uses definite articles much more often than English does.

So a biometria literally means the biometrics / the biometric step / the biometric scan, and that sounds natural in Portuguese.

English often drops the article in similar cases, but Portuguese usually keeps it.

Because estar is commonly used for a state or condition, especially when something is ready.

• está pronta = is ready
• é pronta would sound unusual here

In Portuguese, pronto/pronta normally goes with estar when you mean that something has reached the state of being ready.

Examples:

• O almoço está pronto. = The lunch is ready.
• A sala está pronta. = The room is ready.

Because pronta agrees with biometria, which is a feminine singular noun.

Agreement in Portuguese works like this:

• masculine singular: pronto
• feminine singular: pronta
• masculine plural: prontos
• feminine plural: prontas

Since it is a biometria, the adjective must be pronta.

Yes. The noun biometria is feminine, so you use:

• a biometria
• a biometria está pronta
• essa biometria

This is because nouns ending in -ia are very often feminine, and biometria is one of them.

Here, de modo que means so, therefore, or which means that.

In this sentence, it introduces a result:

• A biometria está pronta, de modo que posso continuar.
• The biometric step is ready, so I can continue.

It is a bit more formal than simply saying:

• então
• por isso
• assim

It is understandable and correct, but it sounds a bit more formal or written than what many people would say in casual conversation.

In everyday speech, Brazilians might more naturally say:

• A biometria está pronta, então posso continuar.
• A biometria está pronta, por isso posso continuar.
• A biometria está pronta, aí posso continuar. (more informal)

So de modo que is perfectly fine, just a little more formal in tone.

Because Portuguese often leaves out the subject pronoun when the verb form already makes the subject clear.

• posso clearly means I can
• so (eu) posso is optional

Both are correct:

• posso continuar
• eu posso continuar

Adding eu can give emphasis, contrast, or clarity, but it is not necessary.

Yes, absolutely.

• posso continuar = neutral, very natural
• eu posso continuar = also correct, with a little more emphasis

For example:

• A biometria está pronta, de modo que eu posso continuar.

That might sound like you are stressing that I am now able to continue.

Because after posso (I can), Portuguese uses the infinitive of the main verb.

So:

• posso continuar = I can continue
• posso entrar = I can enter
• posso sair = I can leave

This is the same basic pattern as in English: can + base verb.

No. Here continuar is being used intransitively, meaning simply to continue.

It implies something like:

• continue the process
• continue the procedure
• continue what I was doing

Portuguese often leaves that understood from context.

Because de modo que introduces a new clause expressing the result of the first clause.

So the comma helps separate:

• A biometria está pronta from
• de modo que posso continuar

This punctuation is natural and standard in writing.

Yes. It can sometimes express result, and in other contexts it can express something closer to in such a way that.

In your sentence, it clearly expresses result/consequence:

• The biometric step is ready, so I can continue.

That is the most important meaning here.

Yes, in most everyday situations that would work well.

For example:

• A biometria está pronta, então posso continuar.

That sounds more conversational and is probably what many learners will hear more often.

The difference is mostly tone:

• de modo que = a bit more formal/written
• então = more common in everyday speech

Yes, but the nuance changes slightly.

• está pronta = it is ready now
• ficou pronta = it became/got ready

So:

• A biometria está pronta focuses on the current state.
• A biometria ficou pronta emphasizes the change or completion.

Both can be natural depending on context.

Yes, it is grammatical and natural, especially in a somewhat formal or administrative context.

Because biometria is often used in official or technical situations, the slightly more formal connector de modo que fits reasonably well.

A more casual version would be:

• A biometria está pronta, então posso continuar.

Both are correct.

A Brazilian would probably understand it as something like:

• the biometric registration is done
• the fingerprint/face scan is complete
• the biometric verification step is ready
• therefore the speaker can proceed

So the sentence suggests that one required step has been completed, and now the speaker is allowed or able to move on.