Hey :)
All good there ! All those white pistils is a verry good sign !
It's an auto, so if you can have 18-19h of light, will be better. This will give more energy to your plant, and she will make bigger buds.
Auto doesn't need 12h to flowering ;) So except if you can't do either way, you should continue on 18/19h.
Good luck ;) (but In my opinion, you don't need it ^^)