Amazons same-day delivery option has been a boon to impatient shoppers in those few areas where its available, and its significantly expanding its reach today — with one notable exception. The speedy shipping is now available in Dallas and San Francisco, letting locals get some of their orders on a given day by 9PM that night. If youre not an early riser, youll also be happy to know that cutoff times for same-day ordering are getting later.