If you recently replaced hens, the stress of integration into a new flock might delay laying beyond the 20 +/- weeks that is usual. Your girls are doing great!
A big thanks to all for the warm welcome. The nesting box roof is fixed. Egg production is up to an average of five per day. I'm hoping for more, but I can live with that. Weather here is cooler by a bunch, (high=mid 80's F.) but still a severe drought.
Anyway, thanks again for making me feel so comfortable here. I'm finding lots of good information.