Hi Taurus,
KKH appointment need to wait a fair bit, I have read in the forum (other thread) that for speech therapy, the waiting time can be a few months.. Why not you make an appointment 1st if you are really worried. Maybe when the time comes, he starts to speak more words and you don't need to bring him for the assessment.
CC environment is good for them to pick up speaking, as there is a need to - because the routine caring will not be as attentive compared to home care - one to one. Perhaps you want to try few hours playgroup 1st? Also, it is better for them to go playgroup / CC at this age then solely home care, they are absorbing alot now, it is good to have some fun, stimulating enrivonment.
My friend's son did not speak until around few months before he turns 3. When he is 2 yrs old, my friend let him attend 2 hrs playgroup because he is not speaking any word then. So don't worry too much. If you are really worried, then get a proper assessment to put you at ease.