when to flush?

I’m new grower and this is all new ! I was wondering if I’m growing outside so I still have to do 12 hours of dark ? All comments are welcome Here are some pictures 63 days old and around the 4th week of flowering! Thanks everyone

My babies (Nirvana Aurora) are 3 weeks into flowering. Does anyone have a guideline on how fast the buds go thru the trichome cycle? Meaning... I am growing 2 ladies hydro in my closet setup, from everything I have researched and read, I will want to flush about 7 to 10 days before harvest, so...