They are adorable,
I just read that if your chicks have feathers coming and they are only a week old (or less) then they will be girls. If that turns out to be true, then I see a few girls in your group.
Are you wanting girls or looking or boys??
I know in most cases people are wanting girls but I know you are building a breeding flock so maybe you want a good selection of boys to choose from.
All of my chicks have feathered out at the same rate. The wing feathers are always the first to make an appearance. If I were to take each one and photograph their wings you would see the same rate of feathering on them all.