white rhino 68 days into flowering, and some of the trichome heads are getting dark amber/brown, while the trichome itself is cloudy, as well as other trichome heads are still cloudy. Is it time to start flushing?

you should have flushed at least a week or two ago because your ready to harvest

The trichomes are already dying. Cut and dry now. Maybe use the water cure method as explained in the grow FAQ to flush any chemicals or nutes out of the plant.

yeah for sure if you take the time to flush then your thc levels will start to dwindle and the buzz wont be near as strong, you should be ready to harvest(all flushed for 1-2 weeks)when most trichs are cloudy ,maybe a few amber, so looks like you are gonna be smokin chemmy weed, but at least you learned your lesson , the hard way mind you but thems the breaks