Agree with others that taking the SAT this fall is a good idea. It seems like he tests well so likely will be able to get an acceptable score on the first try. It’s reassuring for coaches to know that the academic boxes are checked before they commit time to a recruit.
Sub 11 FAT after soph year with good academics will probably get some interest from Ivy coaches. I’d start reaching out now (next few months or so). Use the approach @LurkerJoe outlined.
You can see how things go and then intensify the search as indoor and outdoor times improve and you’re better able to target. Sub 11 now could be 10.60 or 10.90 come June. It’s hard to predict.