In English, the future tense cannot be used with certain time clauses. In other words, there are “no future in time clauses.”
An example may help:
When the packages arrives, I will sign for it.
In English, when your clause begins with:
By the time
As soon as
…the present tense always follows (as in our example above).
In Italian, we use the future tense in time clauses:
Quando arriverà il pacco, lo firmerò.
When the package arrives, I will sign for it.
This is an area where Italian and English grammar diverge, so it is important to use proper tenses as you speak and write!