blue cheese, Seeds From my marijuana plant

iv'e got seeds on my blue cheese plants , has im going to use the seeds i need to know when there going to be ok to remove the hairs on the plants are nice and dark now not one white part on them .do i leave till the seeds go dark,i can find everything on the net but this info ,plz help

the seeds will be ready when the bud is ready to harvest, they want to be large and brown not small and green(ish), then you need to leave em a good couple of weeks to dry once plucked then you're ready to go.

the plants have gone over 50% brown but the seeds are not close to done yet

When the seeds are ripe they will normally pop out by themselfs mate.