Your lady is looking good and healthy, but no where near harvest time, you still have mainly all white hairs. If you do not have a jewelers loop or microscope then one of the best ways to tell is all of your white pistols will turn darker, some turn brown and some orange etcetera. But even with your phone, if you can magnify it to see the tricombs( look like mushroom heads) then thats tge best way. Depending on how you like your type of high determines when best time to harvest. The majority of people go for around 30% amber tricomes and 70% cloudy tricomes.
I hope I was able to help, anything else I can help with just say something, good luck!