FedEx Express shipping with COD options

So, I’ve got this guy in Chicago who picked up his package last Thursday, and he finally got it by Monday. He’s claiming everything is totally paid up on his end, but I haven't seen a single cent hit my account yet. From what I understand, the funds should be cleared and sitting there the very next day after the delivery is confirmed. I'm trying to figure out if I actually need to sit around and wait longer, or if anyone else has dealt with these kinds of delays before?

I've got mine too—spent three days overthinking it before finally hitting up HP Express to grab the cash. You should see yours by the end of the week, most likely.