He was 4.5 years old, around the same time he was fully potty-trained, but still needed prompts. Every child is different. I agree with @A MyAutismTeam Member, just do your best for your child. PECS and AAC device or iPad are helpful tools. I ask my son to type or write ✍️ if I can’t understand him or if he is having trouble expressing himself.

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A MyAutis...

My son was 4 almost 5. Speech therapy helped a great deal. My son is 22 years old now .He never gives a full back and forth conversation but he gets his point across. He lets me know when he wants to eat and go to the store things like that.

Mine still hasn't.
Don't expect too much, just do your best and what comes of it, just accept.
My Son has Words, but He generally has other ways of communicating.

My daughter was 2 years old before she started forming words, about three when she finally started forming sentences. We learned some sign language and that helped a lot.