Brian Steinberg Senior TV Editor Cardi B is joining the parade of celebrities starting to talk about the Olympics for NBCUniversal. The rapper appears in a 90-second promo Saturday evening during NBC’s telecast of the Kentucky Derby, meeting up; with sprinter and Olympic hopeful Sha’Carri Richardson that spotlights the next Summer Olympics, slated to begin July 26. NBCU and its corporate parent, Comcast, hold rights to broadcast the athletic extravaganza in the U.S.