You can tell which ones are laying and which aren't by holding them by the legs and if you can lay 2 or 3 fingers flat between the pelvis bones, they're most like laying or are nearly ready to lay.
Agree with all of the above except....
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... get sultans, you're not needing commercial laying hybrids, you need birds that lay eggs and look good.
Several of you have mentioned protecting your chickens from foxes. I also see a couple of pens that are open topped though; is there no problem with hawks then?
The only problem with open topped fences is that sometimes foxes can jump/climb over them