Breast Pump Coverage

Hello, I am interested in hearing what breast pumps my plan covers, do they cover the Elvie or Willow pump if I were to purchase it with my prescription and submit to insurance?  If not what others are covered, I am struggling to find a list. I also tried applying with Edgepark and they state they will not send until a couple weeks after my expected due date.  My doctor and I believe it should be sent sooner.  I called the insurance yesterday and they stated I can receive up to three months prior but trying to find a company that will do that.  Thank you