I talked to the UPS live chat person and they said that even though my package does not show a delivery date, it should arrive 9/26, but I should keep tracking it because there's a "big chance" it could arrive tomorrow! (Currently on a flight to Louisville and I'm in St. Louis) Yay!!!
Apple said 9/28 in their shipment email.
It will sit in Louisville for close to a day. It was the longest my iPhone sat still. It just departed around 3:00 PM EST.