top banana
noun
°The boss, the leader.
"Only the top banana can make a decision of that magnitude."
°(idiom dated) The principal comedian in a vaudeville or burlesque show.
"He was hilarious, and remained the top banana on the tour for years."
synonyms: big cheese, big enchilada, big kahuna, bigwig more» , big wheel, grand poobah, head honcho, kingpin, muckety muck, top dog