Just kinda have to observe where they are hanging. I do generally see the male in attendence keeping an eye on her or just not giving up opportune "alone" time. They are gonna lay a BUNCH of eggs before they set so you'll have time to keep your peepers peeled.
If you are going to get seriously sucked into chicken math might want to think about looking into a LGD.
I've got a pair of pyrenese, usually let my free ranging eggers range at will, the turkeys, guineas, geese ditto and only lost a couple birds in the begining while the dogs got the hang of it. They're even smart enough to look UP for owls & hawks.
Oh I would LOVE to have a pyrenese, But I have neighbors that HATE dogs. My driveway is 3/10 of a mile long yet my 2 chihuahuas always want to walk up the driveway and harass their 2 dogs who are tied up. They threatened to make them "disappear" so I had to put them on an underground fence system.
There has been 2 times now I have seen the hens coming back together, and they are always coming down my driveway. So when they start setting, will they get off to eat? Will the males guard the nest or stay close?