I definitely will! I know there's no defining red patches that would say roo yet but I guess maybe s/he is still a big young for that.
Many of the silver based ones don't ever get any red on them at all, so you can't always go by that. It is the large patches of white on the wings that tend to show males, but I have seen a couple of pullets posted on here that look like that too. I think black coming in on the breast also shows male. (I don't have first hand experience with this color.)