You're about 3.5 years ahead of where I was when I figured it out!
Good on ya'!
Ha! I really envy the people who are so ahead of the game on this issue.
It sounds like you're doing everything right to me! A day care situation where he can interact with bigger kids sounds ideal.
Even thought I didn't know my son was GT until 6, I was home with him as a preschooler and just followed his lead. I just assumed every other preschooler out there pursued science experiments and was obsessed in great detail with bacteria, germs, plumbing, electrical work, furnaces, etc. I don't think my son is too scarred by me not knowing just by following his lead and listening to my intuition. He attended a very part time play based preschool that was totally open ended and had a science component to it. It worked out quite well.
You'll want to continually reasses the day care/preschool situation but the status quo sounds really great!
