I bought some 14 week olds in, must be around 22 weeks now. Only one of those is sporting a tail - oh, and the cockerel of course. Others do not appear to have tails. Have also got some I hatched, but cannot tell re the tails yet.
My older ones go back to their shed at night, but can be a bit flighty at times......seem to prefer sleeping on the floor at the moment.
Looking on the hopeful side, I would expect pullets to be laying at around 22 weeks plus, although realistically its usually a couple more weeks.