@elinternational I was originally going to start my kid in preschool at 2.5 very part time (two mornings a week, and I would be there one of the two days) at a coop preschool, mainly so she could spend more time with other kids and adults other than myself. Unfortunately Covid hit at that point and we cancelled it, so the next year at 3.5 we started her at 2 half days a week and quickly bumped up to 3 as she was thriving there. This year (4.5-5.5) she is doing 3 days a week 9-3, more than last year. In kindergarten next year she will be doing 9-3 5x a week and I don’t want that to come as a big shock to her. Especially since your kid is shy I would be starting to give him opportunities to practice asap, though probably not 4 days a week.
My kid is way ahead academically as well. The point of preschool for us was practicing social skills and conflict resolution, getting exposed to types of play I may not be doing at home, practice interacting with other adults, and practice being away from me and home. To this end I chose a play-based preschool that does not focus on academics. IMO this is the most age appropriate option as well, and academics are easily handled by me at home.
Kids really start to be able to play with other children around age 3 so I feel like this is the ideal time to start preschool. I want to do two years of preschool prior to kindergarten for both my girls, though only part time.
You mentioned the only good preschool you could find is 4 days a week. I am surprised as most play based preschools near me offer 2 and 3 day a week options, especially for kids aged 3! If that is the only good preschool could you sign up and just only send him 2 or 3 days a week, if you feel that is the right amount?