Your plants have a few weeks left before you see the female pistils. When they pre-flower, you'll see 2 little white hairs shaped like a "V" on the lower nodes. I wouldn't start flowering nutes until you see the white pistils appearing on top of your plant. With any Autoflowering, don't rush them and remember that less is more for nutes unless the plant tells you otherwise. I finished 2 a while back and they only took 70 days after germination. Good luck with your grow. 🌱😎👌