It's a it difficut to say exactly, but it looks as though you are in your second week or so of flowers. Still six to eight weeks yet to go depending on several factors. What has worked well for me in past grows, is to watch for signs of the pistils changing colors. I stop all ferts, and water with a high carb water mix. If you will start watering with 3 to 4 tbs of mollasses per gal of water, (dont know the metric equivalent) you can almost watch your buds swell. High carbs the last two weeks, (three with a kush) will also give you a very sweet cure. This has been my experience...B