They're autoflowers, that means they dont depend on light cycles. They go into bloom on their own. Leave them on 18/6 for the entire grow.
It has showed its sex, this could be considered the very beginning of preflower, which will last for 2 weeks about. The first week you'll see some bushiness developing quickly. The second week, they will stretch, doubling in size.
After growth slows, you can switch to bloom nutes. Enjoy the ride!