The latest One Piece manga chapter is constantly updated. You could follow the official manga publisher's updates or check popular manga reading apps for the current one. Sometimes there might be delays or special circumstances affecting the release.
Recently, there have been rumors of a major plot twist in the One Punch Man manga. But, as always, take such rumors with a grain of salt until confirmed by official sources. Also, some fans are speculating on potential collaborations or spin-offs.
I'm not sure exactly. It depends on the specific adaptation and how they divided the story. You might have to check reliable anime or manga forums for the most accurate information.