Welcome, GCN!
Your child sounds delightful! Enjoy the gift of this extra time with him, without feeling any pressure on yourself or him to learn (or not learn!) anything in particular. You and your wife have obviously done very well with simply allowing him to play and explore according to his interests.
You still have some time to think about his schooling situation when he reaches school age. You will find that there are families in this community who have public schooled, private schooled and homeschooled (or, like us, all of the above) successfully, with much depending on the needs in the moment of the specific child and the exact circumstances of the schools and staff in question.
