The best way to judge if a plant is ready to harvest is by looking at the color of the trichome heads through something like a jeweler's loupe or a microscope -check Amazon. Prime shipping can have them there the next day for less than $15. It's difficult to see the trichome heads in the photos that you posted, but, truthfully, those colas look like they need to fatten up a lot. You might have another week or two ahead of you.