I go to weight watchers - more to maintain my weight than anything, but then I'm 2 years post op. I never felt the need to tell my leader about my WLS and if I dont follow the plan exactly either, I attend more than anything so that I am accountable to the scales each week if that make sense.
In your position, I would say it is far too early to be putting yourself on "a diet" and following SW, or any other plan at this time is not going to give you all the things you need as a WLSer - however, if like me you just like the idea of having to weigh in each week, then no harm done. I would perhaps ring the SW leader if I was as early post op as you and explain that this is what you are seeking from the class right now and wouldnt like to be singled out as slimmer of the week etc etc.
Hope that helps and good luck with your journey x