I ain't no guru and have trouble with this myself but i think you are definitely within the harvest window... still some white hairs on it though. curious to see what others say. nice job! *edit: they are gonna ask... do you have a microscope of some sort?
They are in the harvesting window now....best way is to get a jewlers loupe and get a good look....at this point the longer u wait, the more "couch lock" effect u will have