Same boat here. I have a late walker too (at 18 months) who barely talks.
she had maybe 30 words at 19 and 1/2 months but been showing no progress with her speech
lately.
We went to her GP who said she's fine (he thinks I'm crazy). SALT will only take her
if she hits 2 yo with less than 50 words. At 18 months, they expect 10 to 15 words.
That said, some toddler seem to be very quiet till late and have a word explosion closer to two.
Me personnaly, i would not be worried if she "only" had a speech delay. It's the speech AND gross motor delay that
make me fret.
In your case,if he's doing well with his receptive language, he should be fine. Does he understand a lot of what you say?
Can he follow commands ? Does he point to body parts, pictures in books ect. ?
If he does, odds are he only has an expressive delay.
With DD, receptive language is also a hit or miss. I don't know what part of it his her having an issue and what part is
simple toddler stubborness :(