Good advice and understood about testing early, the advantages of testing multiple times, getting it out of the way, etc. I think most of on this board understand this.
I was more trying to get at what @gointhruaphase said Personally, I would worry more about starting to reach out to coaches than when to test right now.
The OP’s son has a 4.0 and rigorous class load so assuming his times are good, the coaches will pick up on that even without test scores in hand.