You're going to need it.
Several posts on Reddit from folks' local record stores have a lot of them talking about how they only received partial shipments of their RSD orders and getting notices that N1A and other records got VERY little/low stock. There's indications that apparently the "full balance" of the records may ship/come in late or well after RSD.
Get there early and pray. I'm gonna call and confirm/check with my local stores on their hours tomorrow and try to get there early as well. I've got a boot of N1A but I'd like an "official" copy - I really like the packaging on this one.