You aren't going to know even an average timeframe of a plant until you've grown the same exact cut in the same exact controlled conditions multiple times and taken notes. If I were to guess that plant is anywhere from week 6 to week 8.
I am able to chop on x day +- a few days with each run of the same strains, but I have been growing those same cuts since 2019. A seedling will always have a different outcome. GENERALLY SPEAKING the earliest you should harvest most cannabis plants will be 65 days of 12/12 lighting.