All my girls (1 golden comet, 1 buff orp, and 3 black australorps) just turned 20 weeks old and no eggs yet. The golden comet has had a maturing comb and wattles for 2 1/2 weeks now and still nothing...

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Our 3 pullets are about 15 weeks old but not much has changed in the comb and wattles department for a few weeks. We just got the girls roost-trained so no more trying to sleep and pooping in the nest boxes, yay! We know we still have at minimum a few weeks, but I'm excited already
Do the comb and wattles really wait till that same week to "pop"? We have the nest boxes blocked off, wondering when to open them up for business - I had been thinking maybe in another 2 weeks so they don't revert back from their roost-training?
Weekly pics of the girls! (will need to add a 15 week old one tomorrow)
https://www.backyardchickens.com/a/our-peeps-from-5-weeks-until-now