A baseball showcase is one place to get these stats. They happen all over the country and can really range in price. Everything from the very respected Perfect Game to more local showcases. Some of this is really regionally specific. In our area, there are a couple relatively low cost showcases that can give you the metrics and hook you up with college scouts. However, being a 2017, he's pretty late in the process. Not unheard of, just more challenging to find a place.
A couple questions that will help people help you. Geographically, where are you located? Has your son reached out to any college baseball programs at all?