Yes, Fall of senior year. After high school & college starts back up.
This is a great time for your son to evaluate the fit with the team and coach. I would request auditing some college classes in your son's intended major with an escort while a parent goes to the Financial Aid office. Typically, the coach will sit down with your son before the visit is over to lay down his cards. He will ask your son to do the same. Be prepared for that discussion.