How to potty train a 3 year old?

Please no hurtful comments.

My son will be 3 in 2wks time, & he still can’t talk yet. Nor potty trained.
I interact with him daily being a sahm, I have taken him to a speech & hearing specialist however I haven’t seen much improvement… He isn’t diagnosed with anything as they said for this time he has his “own agenda” going on. And it could possibly be a pronunciation problem. I’m worried for my boy because he starts school in a yrs time.
The thought of him not being as ‘advanced’ as other kiddies makes me worry he will struggle socially :disappointed: any positive advice would be helpful…