It's a 10 week flower. So in 2 to 4 weeks you should be chopping her down. lovely looking plant too! Be carefull to over feed and light burn, I notice some dry and yellowing leaves.
I'm growing the same stain and it's have a x3 stretch so if you go into flowering at 60cm you will have approx a 1.80m plant 😱 it's a sativa dominant so you can expect that kind of growth