When does Mike & Molly return?

Mike & Molly is an American television sitcom created by Mark Roberts for CBS. It aired from September 20, 2010 to May 16, 2016. The series stars Billy Gardell and Melissa McCarthy as the eponymous Mike and Molly, a couple who meet in a Chicago Overeaters Anonymous group and fall in love. Molly and her sister, Victoria, live in the Chicago home owned by their widowed mother.
Chicago Police officer Mike Biggs and elementary school teacher Molly Flynn meet at an Overeaters Anonymous meeting. Mike initially lives in a one bedroom apartment and often visits his cantankerous, divorced mother, Peggy. The Flynn household soon adds Joyce's boyfriend and later husband, Vince.