Defining Install Date

My lad is moving into a new build flat next month. It's actually an FTTP install, that's already lit up
and ready for activation. His address has finally popped up on the postcode checker as 'able to order FTTP'

He will be exchanging contracts this week. He's keen to take advantage of BT's Black Friday deals.
As part of the on line sign up, will he be able to choose an install date, as obviously this will need to be in two or three weeks time ?

In reply to a post by broadbandjockey:

My lad is moving into a new build flat next month. It's actually an FTTP install, that's already lit up
and ready for activation. His address has finally popped up on the postcode checker as 'able to order FTTP'

He will be exchanging contracts this week. He's keen to take advantage of BT's Black Friday deals.
As part of the on line sign up, will he be able to choose an install date, as obviously this will need to be in two or three weeks time ?

For the benefit of any future people searching for the answer, he's just applied, and it seems to be up to about 25 days in advance