The United States Postal Service (USPS) delivers to residential and commercial addresses but does not have a set delivery time each day. Usually, when mail is delivered depends on the individual mail carrier and his or her normal route.
For those who enjoy having a set time each day to pickup their mail, a post office box at an official USPS shipping center is a great option. Most of these centers provide 24/7 access to the mailbox via a key card system. They also offer the ability to drop off mail or purchase shipping supplies from a vending machine, no matter what time of day it is.