Resin glands
You want to look at them under a scope or take some macro shots.
Looking for the color of the ball on the end.
You want most of them to be milky white.
Some will be clear some will be amber
Again you want the bulk of them to be milky.
You should probably go read up on
Harvesting when trichomes are ready.
Plenty of images and info exists.
Nice job on the plants