Got my tracking number as well but let's not get carried away with the early phone delivery dates. Sprint does this every year, it'll tell us we're getting it early but then the date changes to the actual launch date.
I did the priority ordering as well but I only had the option of getting the silver color for the Ultra. I would of preferred black but oh well. It's not gonna matter in the end since the case won't be clear.
UPS site says estimated delivery for 3/5/19. Same thing happened last year when I pre-ordered the S9+ but didn't receive it until the actual launch date. Don't hold your breath if it says it'll be delivered early.