The amount of internal damage will depend on several factors, including how long you rode it after it started to sump, how hot everything got, and the amount of oil starvation. I wouldn't be surprised to see piston and cylinder wall scuffing at the very least, but only a thorough inspection will tell the tale. Don't accept the "change the oil pump and give it back to you" response Harley has used in the past on some customers, insist on a full inspection.
So much for the claims they fixed the problem for the 2019's. I just noticed another post about a 2019 sumping and puking the oil at around 4k miles. This is ridiculous.
Jerry