That all depends on when you order. Sorry it's not crystal clear. AT&T is allotted so many phones right now that they will have for Sept 19th, once those are depleted then the delivery date is pushed back til the next batch of phones are provided to them by Apple.
Yes. In fact, last year, my son got his 5S ordered via ATT on launch day which infuriated my other son who got his 5S ordered from Apple three days later. Both were ordered within 10 minutes of the midnight preorder period. BJ