Both mine were big babies, (over 22lb at 6mo) & I didn't do a dream feed with DS2, but kind of did with DS1 (although before I found BW) DS1 dropped it (as he woke for a 10pm) around 5mo (only to wake for it when illness, teething & childcare mucked every thing up at 7mo) With Ds2 I never DF & he started sleeping 11hours without a feed before 4mo (then a 3 day stay in Hospital messed that up & I was back to feeding a "newborn" due to supply )
If you wake him for a feed & he is a big baby I'd give it a go & see what happens.