It ends at a specific chapter, but I can't recall exactly off the top of my head. You might want to check online manga forums or dedicated One Punch Man fan sites for the precise chapter.
One Punch Superman was now finished. Although the story was very exciting, due to the limitations of the story rhythm and battle scenes in the manga, the development of the story did not reach the height of animation. Therefore, some people thought that it ended in a hurry.
There was no official news on whether there would be a second season. However, the original manga of One Punch Superman had received a lot of attention and love from readers in the past few years, so if the animated version could be successful enough, it was likely that there would be a sequel.
One Punch Superman was finished. Although the plot of the first season was very exciting, the animation production company did not seem to have any plans to continue the second season. However, fans of One-Punch Superman could still continue to enjoy the story through comics, novels, and other media.
In general, the One Punch Man manga does pick up from season 2. However, the anime sometimes makes adaptations and changes that might not be exactly the same as in the manga. So, while the main storyline continues, there could be nuances.