I had my SRS with Dr Meltzer, so this might not be applicable. I don't know if Dr Thomas employs a similar two-stage procedure, where the clitoral hood and inner labia are constructed in a secondary labiaplasty procedure. If you've still got sutures and whatnot in that area, it's best to wait until those have dissolved and the swelling has gone down.
That said, I started trying to have orgasms shortly after the 2-week mark. Not, however, from vibrators or vaginal stimulation; rather, I focused on areas around my clit (not my clit itself, which was too sensitive) coupled with my favorite erotic materials. It took nearly a week to have an orgasm, mostly because everything was just too numb, and in this respect I think I started too soon and I frustrated myself a bit. The first few orgasms were also incredibly weak and not exactly satisfying, other than the fact I actually had them and found that immensely reassuring.
But I do think tending to this sooner than later probably helps to get the nerves from becoming too dormant; as always, check with your physician first, he might have different requirements or fewer concerns if you're focusing only on your clitoral areas.
