Yes, it is way too early to think about the colleges – especially too early to focus in on a few hyper competitive universities. I would impress the following things on DS.
–Do as well as possible in the most rigorous course-load he can comfortably manage;
–Get involved in activities he cares about and can make a meaningful contribution to (most importantly when in HS);
–Enjoy time with family and friends.
The only goal right now should be to have your S become the best possible version of himself – later you can see how things work out in terms of college plans.
If you absolutely want to look at the averages for some colleges you can google the school’s common data set (google "common data set XYZ University)and you can see many statistics in section C. Here is one for Columbia College as one example. https://opir.columbia.edu/sites/default/files/content/Common%20Data%20Set/CDS%20College%20Engineering%202022-2023.pdf
BUT for the elite colleges, the statistics do not tell the full story. With acceptance rates under 10% (some under 5%) there are many more well qualified applicants than spots available. Applicants with perfect GPAs, perfect standardized test scores, and strong activities are routinely denied admission.
If you do end up considering US colleges (and personally, I’d hold off thinking about college until junior year of HS) consider if affordability might be an issue. And instead of focusing on a few of the most competitive universities, I’d encourage you to all keep an open mind and broaden your horizons. There are tons of amazing colleges and universities throughout the US where your son can get a fantastic education and have a wonderful four year experience.