you have time , your seeds look close , the plant wont degrade/die over night
let them go a few more days , if the seeds dont darken by then they prolly wont , ive seen seeds stay sorta green but be fully mature and viable , ive also seen seeds that were light grey yet fully mature and viable
when you do feel they are ready enough do not pluck them off the plant until good and dry or you risk damaging the butt end of the seeds rendering them useless
best of luck
peace