I think they had an all female (tech and cabin) for the first time back in the early nineties on the 767.
There are quite a few around now. My first four trips had female tech crew (2nd officers). There are at least 2 767 captains and one on the 743 and one on the 744. Quite a few are FOs and there are even more SOs.
I would guess around 50 total out of just over 2000.