I have the same question. Previous phones came via FedEx. Mine says delivers BY 10.30. Not sure how early they start.
Mine says by 10:30 AM as well.
I deliver in California and there are 3 start times for everyone in the A.M...... 8:15; 8:30; and 8:45. Hope this info helps!
But from what I have gathered.... the commit time for the iPhones is end of day! So it could be anytime during the day depending on deliveries for the day! They will be delivered in trace!!!!