The one with brown looks male. It's the red coming in on his shoulders and back of the head... unless that's a trick of the light.
No others are showing their combs and waddles well enough, But at that age it should be VERY obvious by waddles and comb who the males are. I have some hatched Thanksgiving that are very clear in gender and have been for a few weeks now.
Beyond that with the darker ones, any sporting green on their tail or wing feathers will be male... as well as anyone who's comb and waddles look nice and red. There should be virtually NO waddles on the females. Females are *usually* a little shyer and smaller. Males won't be sporting their slightly longer tails just yet. But their combs should be fairly swollen/large compared to the females.
I did see one line recently that had really small combs and waddles on their males eve older, but isn't my usual experience. In fact I really won't even try to sell "straight run" past 3 weeks... because I can usually tell the BOYS, by behavior. Though not all boys of course and there is the occasional extra spunky girl.
So in other words... I've probably been no help at all!
Hope you get some girls, they are little beauties!