For comparison, here is my SLW pullet at 9(ish) weeks. She has a very small comb and wattles that are still light in color. Also the amount of white on your cockrel's wings, I've heard, is a good indicator.
Wow! What a difference rubycanyon! I can definitely see it now. But shucks!
I really wanted a SLW!!! And even though he is beautiful, weare not allowed to have roosters on lots smaller than an acre. Anyone in Maryland who'd like to own a fabulous SLW Rooster? lol I'll sell him to you pretty cheap!