The DLC are decent size, and it sounds like besides Vendrick you have one major boss to fight, along with the “Giants Memories” thing. You have probably already met the final boss as I believe it shows up automatically after you beat the first boss in the throne room. When you beat the final boss there is a large cut scene and you end up back at Mujala and are asked if you want to start NG+ or continue with your current game.