MID-CREDITS: Superman and Krypto sit on the Moon and look at Earth.

POST-CREDITS: Superman and Mister Terrific finish rebuilding a building that was damaged during the final battle. Superman says the building is crooked, Mister Terrific gets annoyed and walks away kicking rocks.

https://comicbookmovie.com/superman/rumor-supermans-post-credits-scenes-have-been-revealed-following-first-screenings---spoilers-a222457