That is definitely Great. I have been working with a kid from this site and he actually got sent a blast from headfirst a couple months in advance so we can use that for practice.
Metrics I care most about are bat speed, swing time and VBA. Our goals are mid 70s consistent batspeed, attack angle around 12-15 and swing time .14 or better.
You still need to hit in games of course but you can do a lot of fun stuff with it. For example we recently found out that his vba on low pitches inside is almost 15 degrees less than on low and away because it got flatter as the swing progressed so then we could create drills to combat that.
Fortunately his AA was already almost ideal which was expected because we estimated that with a camera before and his swing time is around .15 to .16 which we try to shave off 1-2 hundreds off.
Definitely a shout out to him as he has been working extremely hard increasing his EV from around 80 last summer to touching 91 this year and making big improvements in swing quality.