mcbryon,
I went the traditional, professional route in 1976 to climb the corporate ladder. Bailed out 20 years later to figure out what I liked/enjoyed doing. Some of it involved the same skill set as management, some was quite different. Mostly, I found I enjoyed being a one man band. I should have gone into the trades, a bakery business, or a landscape business. I am told I would have been a great doctor, but I would not put up with the path to get there. I also coached college kids and high school kids. However, we did not have kids of our own.
So, I can only offer what I think I would tell my kids if we had any:
As a college coach, I found that most juniors are not super focused on what happens after senior year - too far away. By mid-senior year, those same unfocused kids started to make plans because their friends were making plans. So, I would not worry alot this year or even through much of senior year.
Although he may not like what he perceives as nagging, start asking him what he thinks of different jobs - trades, coding, insurance sales, etc.. Does he understand what his parents do and what they like/dislike about their jobs? Other family members, etc.?
I went to an IVY school and would never recommend that path to anyone. I suggest going community college or small school to get the basic classes done for a small price tag, figure out what interests him, and mid-way through start looking for 4 year colleges that offer what he might like. College is less about what you major in and more about figuring out life. I majored in Biology and ended up in management, coaching, the laundry business, and research before switching to coaching, motor coach driving, and event management.
Let him know that there is no single career/life path that is the best for him - just some are better than others. You read so many posts on MMM from people who don't like what they do which makes life a misery and is not healthy.
The best letter my Dad ever gave me was a "to be opened upon my death" letter in which he said he was proud that I followed my own path. Wish he had told me that when he was alive, but still.
Based on your description of your son - he will do just fine although it might be an unorthodox path - a brightly colored tapestry just the same. And, support him along the way by listening, asking questions, and just being there...
Good luck!