Different people sign after every practice.
It may be Reggie and Brees etc, or it may be rookies, or defensive lineman.
Someone always signs after practice, never before or during.
Your best bet is usually in the afternoons, b/c in the mornings they are on a tighter schedule.
Saturday at Memorial will be your best bet, this Tuesday night, most of the team signed for a few minutes.
Reggie stayed late as usual when he signs he does it for a while.