It can (I always prepay). I wouldn't sweat it, it should update before midnight with all of the processing tracking. If not, wait a couple days and see if it updates in the morning when it's due to arrive in the receiver's processing hub. If you don't see it by then, it still might not show up at all until it's actually delivered (happened to me before, can happen when the tracking bar code has issues/USPS is sucking).