Nearly everything I mail from Tucson is at least 2-days away and that is when I use the main Post Office during regular business hours! I rarely use out-lying Post Offices, because they simply collect mail all-day long and deliver it to the Main Post Office for sorting. (I would be shocked if mail sent from one of those points would be delivered within 2 days to a Tucson address!)
Anyway, since I mailed it Saturday, I use one of those out-lying Post Offices, AND I mailed it just before closing! So I am really shocked that you got it today!
Jim