This is insane, do not follow this advice (not trying to be rude to gopre). If you honestly think you're going to get an AT&T phone from Best Buy quicker than ordering it directly from the carrier (AT&T), then you're in for a rude awakening on Friday. Especially if you pre-ordered early Saturday morning. It's nonsensical to think that a phone ordered over a week later from Best Buy would arrive any sooner.
I feel like a broken record here, but AT&T does this every. single. year. Since AT&T stock piles these phones in their own warehouse, they don't give you a tracking number until 1-2 business days before it's supposed to arrive.