L'enviament arriba demà i el lliurament serà el dilluns.

They are related, but not identical.

• enviament = shipment / sending / dispatch
• lliurament = delivery / handover

So l'enviament is the thing being sent, or the shipping process, while el lliurament is the moment or process of delivering it to the recipient. In business or tracking language, this distinction is very common.

Because Catalan usually shortens el or la before a word beginning with a vowel or silent h.

So:

• el + enviament → l'enviament

This is called elision. It is very common in Catalan spelling and pronunciation.

Catalan often uses the present tense for a scheduled or expected future event, just like English can do in sentences such as The train arrives tomorrow.

So arriba demà means arrives tomorrow and sounds natural. You could also say arribarà demà, which is more explicitly future, but arriba demà is very normal.

Serà means will be. It is the future tense, third person singular, of the verb ser.

Here:

• el lliurament = the delivery
• serà = will be

So el lliurament serà... means the delivery will be... or more naturally in English, the delivery will take place...

Because this is not talking about a temporary state or location. It is talking about when something is scheduled to happen.

In Catalan, ser is used for this kind of identification or scheduling:

• La reunió serà dimarts. = The meeting will be on Tuesday.
• El lliurament serà el dilluns. = The delivery will be on Monday.

Using estarà here would not sound right.

Catalan usually does not need a preposition like English on before time expressions such as demà or weekdays.

So Catalan says:

• demà = tomorrow
• dilluns / el dilluns = on Monday

This is very normal. English needs on Monday, but Catalan often just uses the day itself.

This is a point that often confuses learners.

With weekdays, Catalan can use the day name with or without the article, depending on context, style, and sometimes dialect. In many standard contexts, dilluns by itself is very common for a one-time upcoming Monday. El dilluns can sound more definite, and in some contexts article + weekday can also be used for habitual meaning.

Here, because of the context, el dilluns clearly means on Monday / this coming Monday, not every Monday.

The accent marks are important in Catalan. They show which syllable is stressed, and sometimes they also help indicate vowel quality.

So:

• demà is stressed on the last syllable: de-MÀ
• serà is stressed on the last syllable: se-RÀ

These accents are part of the correct spelling, not optional decoration.

The beginning ll can be tricky for English speakers.

In many Catalan accents, ll sounds roughly like ly in million. In some modern pronunciations, it may sound closer to y in yes.

So lliurament begins approximately like:

• lyu-ra-MENT
  or, in some accents,
• yu-ra-MENT

The stress falls on the last syllable: -ment.

Yes. A speaker might also say something like:

• L'enviament arriba demà i es lliurarà dilluns.
• El paquet arriba demà i es lliurarà dilluns.

These versions use the verb lliurar directly: es lliurarà = it will be delivered.

The original sentence with el lliurament sounds a bit more formal or business-like, which is common in shipping or delivery messages.