My guess is yes, with that much comb development at that age. If it turns pink in the next 7-10 days, you can be more sure of a boy. If it remains pale, you may still have a girl.
I honestly can't tell at this point. If you suspect it's a cockerel, you should probably start thinking about what you're going to do with him once he gets older. Do you want a cockerel? Are you allowed to have them in your area? If you don't want or can't keep a cockerel, your options are fairly limited. Euthanize it, or find it a new home. Maybe grow it out and put it in your freezer. Other than that, there's not much you can do.
I agree with harmony fowl. If his/her comb gets anymore red/pink I'm sorry to say but you might have a roo. Somthing tells me he is a cockerel(other than the comb) and that mixed with the comb probably means he is.
It looks like a cockerel to me. The comb is the main indicator, and like Hazelbunny I have a feeling that it is a cockerel.
x2 on waiting to see if the comb turns pink.