The forms are required before any loan proceeds can be disbursed to the student’s account. Getting a loan involves accepting the loan amount (typically on the student portal), completing entrance counseling & completing a Master Promissory Note (the last two steps are usually done online on a federal website).
If he completes entrance counseling & the MPN, the money would only be automatically disbursed to his account if he has actively accepted a loan amount (again, this is usually done on the student portal, but some schools might do it using a signed award letter).
If you want to wait, he can complete entrance counseling & MPN later, when he decides if he wants to borrow. He will need to accept his loan, complete entrance counseling & complete an MPN. He can do this at any point in the year, as long as he is enrolled at least half time when the loan is disbursed.