so much of when to harvest comes down to personal preferences, so don't take any suggestion too seriously.
Once the calyxes are no longer plumping, start scoping the trichomes... after that it is personal preference as to how much cloudiness or amber you want etc etc... be systematic.. try different levels until you find what yo like.
Even without a staggered harvest, there is a difference in ripeness top-to-bottom. so you can test a range from a simple harvest. Scope a few buds at differen tlevels, mark them with % amber and keep them sepearte and organized. Now you can test multiple states of ripeness from 1 harvest and that will hasten the learning curve as to what you prefer.
best guess -- looks liek some plumping remains, then 7-10 days beyond that is likely... lots of moving variables relate to genetics. Some genetics may not even show amber and you sit there with your dick or flaps in your hand watching it rot on the stem, lol. If it seems to be taking a long time after it fully fattened up, consider that as a possibility. if older calyxes start to hollow out and turn purple (not just a purple plant), that's a sign of over-ripening. preflowers will do this before the rest since they are the oldest.