I usually check them 24 hours or so after uploading to make sure I entered the numbers right, if no tracking events on eBay I check via AP to make sure there's results there (if I've gotten one wrong, I'll usually have gotten multiple wrong, since I copy and paste the first number and just edit the last few digits as needed). 

I checked a few just now and got a really weird result with AP on one of them - it said no results but was one of over 100 numbers that I could select from in a dropdown menu (never seen anything like that before) 🤔

Most were showing as delivered, but of the ones that had no results, nothing showed on AP either, so I can only presume I got the number wrong (they were all sales from early April I was checking, so I would have heard something from the buyers if not actually delivered so I didn't bother checking back and updating lol).