A few months after i bought the chickens, I have observed several signs that they are ready to lay eggs. The hen's comb, face and wattle turns bright red and she makes a "pre-egg song" that sounds like "kaaak-kaak-kaak-kak"...like she's cooing. I also noticed that my hen seems friendly that when i try to touch her, she will do a funny squat bend down with her wings arched and then raise her butt as if a rooster wants to mate with her. After I give her a back massage, she will stand up and then shakes and ruffles her feathers.
Here is Cutie Pie enjoying a back massage.
Another sign is a red comb, face and wattle.
Cutie Pie checking out her crib.