Every school is different. Personally I don't bother sending wordless books home. I do see the point in them, as they're great for getting children to tell stories in their own words, developing their oracy and comprehension skills. We do use them in school during whole class sessions for this purpose. However, I find most parents either get confused what to do with them, or don't see the value in them, so I don't send them home.
We send a library book for pleasure from day 1 (changed twice a week) and scheme books with words from about week 3. This is for all children, regardless of ability. We ask parents to read it to them to begin with, asking the children to spot sounds they might know and listen for what the word is, after the parent has modelled sounding out and blending. Most children have completely taken over from their parents now and are moving swiftly through the units. Those who are finding it tricky are moving at a slower pace, staying on unit 1. I do think it's important they get to practise sounding out and blending at home from pretty much the off.
All schools are different though and all schemes are different. Some insist on no books (or no books with words) until the children have reached a certain unit or achieve a certain tick list of skills.
From what I've heard, it's sadly not unusual for some schools to still be sending home wordless books in November. From what you've said he can do, he doesn't sound behind at all to me.