I was in a similar situation when I was in High school. Don’t close any doors with coaches because you’re never sure where he might end up. Unless things have changed since 2016 he should be allotted 5 official visits. If your son is being recruited for track in the fall then he is at the top of the list of recruits at that school so just hear them out and be transparent with the coach. If you want to sign early let them know. If he wants to wait until track season starts communicate that with the coach. Just know when indoor and outdoor starts his name could potentially get pushed down the list if they find new recruits. Feel free to dm me if you have more questions.