Hey JD,
I don’t know anything about Cashwave but I seen at GPWA they offer check, wire or Neteller for payments. If your payment is coming via check or wire and they process payments on the 16th, chances are good you wouldn’t have received a check this fast, and a wire is iffy. Tomorrow is a holiday too, so you wouldn’t count that. There’s only been two business days so far since the 16th. I wouldn’t worry about a wire that fast. They’d have to be super prompt for you to have received a wire that quick. And there’s no way a check would have arrived that quick I don’t think.
I personally know nothing about them. But if they do payments on the 16th then I’d be watching for it next week. Unless you have a faster payment method setup.