I think your all covered here but those look like they are more clear than cloudy and I dont see any amber So I think you have a couple of weeks left. If I were you I would start to flush when I see 10% amber on the calyx, sugar leaves will start turning amber a couple of weeks or more before that. You only need to flush for 3-5 days in coco so there is almost no risk of a new grower starting too late. lol. 

Dont rush, those are some great looking Trichomes with big fat heads. You have done great so far so don't rush.