Hello, I am in the Bahamas, our climate is similar, they lay between 9 and noon in my yard, sometimes I get an early egg around 7. Yes some do announce when they have laid an egg, others don't. You could put a golf ball, a nice round stone or a fake egg in the yard nest box. It really works, my chickens only lay in the box with the golf ball. I have three boxes, even if I switch the ball around they will only lay in the golf ball box,