Wow, I wish my cats loved my chickens as much as Foxy's cat does!
I agree there shouldn't be a problem. My cats have been here for 10 years so when the chickens arrived they were VERY freaked out by them. But they didn't try to attack at all, they were more scared and confused than anything else!
The chickens were enclosed completely but still got a little startled every time the cats tried to be inquisitive.
One week later and one of the cats is still a bit unsure of them but definitely doesn't try to upset the chickens, and the other cat has taken it upon herself to defend the chickens against the other neighbourhood cats! Which is very sweet
Basically, I think you'd have a worry if you had chicks, not anything that's bigger than a crow.