How long does it take USPS to ship my package to Chicago from New York?

I ordered an iPhone 5 from Groupon on sunday at about 4 in the morning lol couldnt sleep. But i got it for my little sister for her birthday. And I checked today on groupon to track it and it said it was from NYC and that it was shipping soon by USPS but won't let me track it. And her birthday is on Wednesday I just want to know when it will come because she's been wanting an iPhone for the longest!

Depends on the class of mail.

3 to 6 days

You can't track it until it ships If you mean tomorrow Wednesday, isn't happening. If you mean next week, you have a chance but not a real good one.