Overnight shipping from postal office?

My mom is sending me an iPhone 5 tomorrow and she's sending it out with the overnight shipping option at the post office. If she sends it Tuesday afternoon will it come Wednesday or Thursday?

It'll be Wed or Thurs. The post office doesn't follow their rules as obsessively as FedEx or UPS, but they're pretty good in my experience.

If it is shipped early enough tomorrow express mail, you will receive it Wednesday. Once in a great while it will fall over to the next day depending on when shipped and where to but that is rare. Let us know when you get it on Wednesday. If not received on Wednesday check the tracking# that your mother will receive to find out when it was really mailed out. Moms are busy and sometimes do not ship until the following day. Been through that several times.

If the package arrives at the Post Office by 4:00 pm on 27 May, and is sent using the United States Postal Service (USPS) overnight service, the expected delivery date and time on the USPS website is stated as 28 May by 3:00 pm.