I mailed priority mail two packages yesterday.. I'm in Oregon and one went to California won't get there until mid next week and one to north Carolina and it's supposed to get there tomorrow.. I can't believe it.. and with our postal service I doubt it will get clear across the country in two days and California in 4-5..
I'd assume that the place you ordered from is closed for Christmas.. everyone needs a break.. don't count on the postal service to get it on time.. but likely quicker than if shipped regular mail.. id assume that next week you will get the tracking number and hopefully you will already have the package..
it's hard to wait sometimes for things, at least for me if I have something apart in the shop I just want it done so I can get on to something else..
Mark