Sometimes I get it the same day because I meet the truck at the store...take it right in the shipping bag. Less stress on the fish. Then it doesn't have to go in the LFS tank, and then mine. We can skip the middle man.
Or you can leave it at your LFS for a bit to see how it's doing. Will the LFS hold it for you? Sometimes they don't. Someone could come and buy it out from under you.
Either way....it's best to quarantine the fish once you get it home. That way you can make certain it's not going to bring a big headache into your tank.