Usually release date but there are exceptions. You just need to check with whoeveryou are ordering from.
for example, if you Pre-Order from Amazon AND are a Prime Memember, you get guaranteed release date delivery for free.
Ive Pre-Ordered like this from them ande its always ben on my doorstep the day of release.
Gamestop will guarantee it on release date as well, but you must pay for overnight charges.
You could also order the Digital version through Origin and download immeately when available.Origin will be required anyway.