I can see in your photograph that your trichomes are cloudy, see the white colour they have on the leaves. you are looking for amber trichomes, most people harvest between 5%-30% amber trichomes. harvest at 5%-15% amber trichomes for a "head high" energetic effect and harvest at 30%-50% amber trichomes for a "body stone" sedative effect strain dependent. how long do you plan to flush your plants for?