I hope you treated the masks with the same care. I think 24 hours of non-contact should be enough for natural fabrics. Synthetic might be a bit longer. All this means is you put the masks in a safe container, and then go wash your hands. 24 hours later, it's safe to put them on and use them.

Huffpost has a story about the effectiveness of different mask materials. And don't forget, wearing masks doesn't protect you from infected people coughing or sneezing. It protects others from you!

If you need protection, the best is to stay home and avoid delivered items and mail until it has sat around for a day or two. If you do have to go out, keep social distance from people in masks and stay far away from people without them. Wear eye protection. Eyeballs are very susceptible. Never touch your mask until you get home, and then treat the outside of it as if it is contaminated. Remove it, put it in it's container, wash your hands, and then shower and wash your hair. Disinfect anything you touched while out.