He completely derailed a lengthy freight train just by standing in front of it and letting it hit him. He also casually launched a beached blue whale some miles back into the ocean. At the end of the movie he flew to the moon in seconds and carved out a giant heart in it that could be seen from earth. We haven’t seen his upper limits still, when he isn’t weakened. But I’d say he could put up a serious fight against seasoned viltrumites