Welcome Trina! Congratulations and sympathies as well lol.
I have a DS8 who has been accelerated 5 years for math and about 7-8 years in biology and chemistry. He will be taking high school math and science full time for the coming school year. We homeschool, using an eclectic method--partial unschooling (conceptual math and science), partial structure (mostly for online math homework and his high school science labs via our non-brick-and-mortar charter school). I say this just to present to you one option to quench the thirst of your obviously brilliant child when you think he is ready.
When my son was 4 many people told me to let him be a child and I did...but I wasn't prepared for a child who devoured books the way he did and I was constantly searching, searching...for something that would help me balance the hunger of a child who was extremely asynchronous in ability vs development. It was SO difficult, to make anyone understand that this is who he was. That learning was what this child wanted. It got so difficult to explain to people that I started focusing on his inabilities instead just to deflect questions and disapproving looks.
It all finally fell in place when we had him tested recently. I sent his scores to a psych recommended by a friend and she interpreted his scores for me (in addition to the wonderful help Dottie gave calculating his extended norms). She gave me the appropriate percentiles (earlier tester didn't) and suggested I just let him "go" as far as he wants to. It was very helpful to hear her say that. I used to keep holding him back and it wasn't helpful to him. My son isn't extremely driven to learn, I've seen kids who are and mine pales in comparison. But I now see and hear the sigh of relief from him. Besides, our homeschooling lifestyle gives us the flexibility to slow down later if needed.
I say all this because I believe, like Dottie, that given your child's scores, he may be ahead of mine. I wish someone had told me when my son was 4 what to expect. I had to make many mistakes before realizing all that I know today. I would have worried a lot less and stopped focusing on his inabilites and would have been so much more confident facing the naysayers.
I hope it is helpful to you in some way to know that 3, 4, 5 or more years later we're still figuring things out, but it's okay, and that our children are doing well and thriving when the right accommodations are in place. We tried finding other accommodations but nothing worked...learning at home and via custom-built classes and workshops with other homeschooled children has been the only thing that's been obviously successful for my kid. Finding other kids like him wasn't easy either. Took about 3 years of trial-and-error before we stumbled upon a group of great, kindred-spirit families.
I am not advocating homeschooling as the only way...just giving you confidence that you can do it and that some kids really thrive in such an environment. But that if you take this step, to be mindful that it may take a while and be more difficult to find a peer group for him.
Oops, I'm in a bit of a rambling mood today! Sorry!

I wish you all the very best...it's not a journey we choose lightly...but it's wonderful, humbling and very, very educational, at least for this often clueless mom.