I am sure someone will have exact figures, but I understand about fifth or sixth of crews now trained (about 130 drivers).
The number of suburban diagrams is about 55 (although can say anything from 42 to 68 depending on if exclude outer suburban, or include all services planned when fleet was ordered).
So operating just 5 diagrams today is about tenth, well behind crewing knowledge. But would expect crews to be higher to avoid complicated crew allocations. Although by now ought to be close to adding a diagram each week (at least on paper, even if they find it difficult in practice).