From those pics you just posted, it does look like a roo. Hard to tell with white feathers! here is a picture I grabbed off the internet to show you what rooster saddle feathers will look like.
I'd like to say that hens don't start to lay until around 4 months, I might be completely off on...
Pretty sure that white one is a female, so yes, there is a good chance of it getting ready to lay. Putting golf balls in the boxes helps them figure out where to lay. Idk wry neck.