The deal can be found in the "offers" section of the app and is slated to run though December 27, 2020.
The Breakfast Baconator features a fresh-cracked egg, six strips of applewood-smoked bacon, a square sausage patty, two slices of American Cheese, and Swiss cheese sauce on a toasted premium bun. It normally goes for $4.39 in my area and is currently tied for their most expensive breakfast sandwich (along with the Maple Bacon Chicken Croissant). You can find my review of it here.
Photo via Wendy's.