Eastbisanswered grow question 4 years ago Usually I switch at week 5.
But Your plant looks a bit slowly. plants like that I have at 10 days.
Your plant it's even an auto so should be more fast then mine.
But don't worry.maybe they need more time because the light it's not strong enough..
Leave the light at 18on 6off.for few weeks more..
And tray to switch the light at 12.12 when you want to your plant go into the flowering stage.
If you use nutrient and bloom follow always the nutrient schedule.
Enjoy and stay safe