They are a group of seven women who live in California. They grow marijuana, and make and sell hemp-based products.
However they are not "real" nuns. The group was formed in 2014, and they are not affiliated with the Catholic church in any way. In fact, I read an article that said they are against religion. They said their Holy Trinity is the marijuana plant.
They are a small business. Calling themselves nuns and wearing habits is basically a gimmick to advertise and sell their products.