How do you know when seeds are ready to pick in autoflowers?

This is my first grow and I decided to go with short stuff because they seemed to have a good reputation and with autoflower because of space issues. I bought fem but wanted to start with regulars being this is my first grow. I planted 2 dr feel good and 2 Himalayan diesel figuring if a plant dies I'll be okay. I want at least one male so I don't have to keep buying seeds. But the one thing I can't find is when to pick the seeds from the male I don't know if it being an autoflower makes a difference. I do know that I would love to make a hybrid of the two but don't want the females to be too seedy. So I wanted to see if picking the males out once the seeds were ready would make the females have less seeds and also when to pick the seeds from the males. Any help is greatly appreciated. THANKS TO ALL WHO AT LEAST LOOK!!

That thread is amazing I will now save the some pollen for my next harvest and create more hybrids... Assuming I like the traits it is showing! Thanks