NBC's TONIGHT SHOW Scores Most Dominant 18-49 Victory Since JanuaryMay 2, 2017TONIGHT SHOW STARRING JIMMY FALLON has won the late-night ratings week of April 24-28 in adults 18-49 by a +50% margin over CBS' “The Late Show with Stephen Colbert,” for “Tonight's” strongest weeklong advantage versus “Late Show” originals since January in that key measure.