Google Now Shows Wait Times at Your Favorite Restaurants
It works in the search bar as well as Google Maps.

Google will allow folks to navigate through harsh waiting lines by showing wait times of up to a million sit-down restaurants around the world. During your search of the restaurant on Google (or Google Maps), if users open the business listings and scroll towards the Popular Times section, they will find a current estimated wait time.
If you’re planning an excursion hours ahead, the feature also allows you to select any of the hourly bars to see an estimated wait time for that time period, with an overall breakdown of wait times for the day. Yelp announced last year a similar feature using remote queuing, but Google skips the extra waiting altogether.