Not sure when they are available for Angels in America, but most box offices seem to print them 1-2 hours before curtain and they're ready in an envelope with your name on it. I used to think they printed out the best seats for early arrivers, but it doesn't seem to be the case.
Ordered tickets for both parts 8 days in advance. Picked up my tickets around 5:15 for a 7:00 show. Tickets were already printed in an envelope with my name.
From my experience I think the sooner you get your tickets when the drop on TDF, the better your seats will be. I'm assuming they have a list and the top names are those that bought first on TDF. With that being said for AIA I got front mezz J8, not great seats but definitely better than some I've seen posted here.