You can do whenever, the plant will at least double in size if not triple so be careful on space but if you wanna flip her now it would be a good choice
When you plant show these it is tell you it is mature enough to go into flowering. I’d trim some of the lower leaves to get some air flow through the plant.
Thank you for the info
Get in there and clear out a lot of those shade leaves. She looks healthy but a bit of defoliation will really help get some airflow and light deeper into her which will result in better bigger smokable buds and less little airy not so premium buds and less chance of mould or rot etc. They’re weeds, she’ll handle it, then give her a week or so before you flip her👌