THE USPS MAY NOT SHOW THE TRACKING,BUT IF YOU PAID WITH PAYPAY GO INTO YOUR ACCOUNT PICK YOUR ITEM AN HIT TRACKING
IT WILL GIVE YOU A CURRENT UPDATE.
It's Sunday. If it's not priority mail express or Amazon packages they won't update because the mail doesn't run. It stays at the plant and is processed on Monday
may be because the item is " in transit" which means that the item is on a truck and there will be no new scan on it until it arrives at the next destination
EDIT - if it is not delivered by Mon, then contact them - info is on their site
because there is no update