CHICAGO — The Chicago Cubs, which waited decades to install lights at Wrigley Field and has waited more than a century to win a World Series, took a giant step toward ending the wait for something every other team in the majors already has: a Jumbotron.

The city’s landmarks commission, which must sign off on such plans because Wrigley is a city landmark, approved a plan Thursday to allow the team to build a first-ever electronic Jumbotron and other sign above the ivy-covered outfield walls.