Hi there! From this single picture, to me personally do not really looks like ready, or close, to the harvest window.
When I had no tool to check the trichomes, I found this page very useful, check it out if can help: https://www.growweedeasy.com/ready-for-harvest-pictures
But is truly the best thing to check trichomes. At first i used a super cheap jewlery loop, which did its job but was terrible to use, and switched to a digital usb microscope to properly check trichomes without stress for my eyes.
Hope this was helpful, happy growing!