Northern lights auto 6 weeks 32inch no flower

I am a new beginner. FIRST time everything. I have a northern light auto that hasn’t flowered or maybe it is starting to flower …im so new I can’t tell lol…I have it on a 20 hr light cycle 4 hrs off. Should I be switching it to 12 on 12 off …I just don’t know its most likely on its 7 week more than 6 week. I have it in 5 gallon pot…never transfered it . It looks healthy. Any advice will help. I appreciate you all. Thank you …here are some pics

Looks to be at the beginning of flower to me.

Thank you …like I said this is my first go at it …so recognizing diffrent stages is new to me. Thats good to hear