For Garou, all of 167-168: A punch from him and Saitama had its shockwave redirected which took out countless stars and left a void in space, grabbing Saitama and flying from Jupiter to the Sun in seconds at most also showing he’s at least FTL.
Everything I posted with Zeref is just common knowledge of what he’s demonstrated. Even Natsu vaporizing him with a Demolition fist didn’t stop Zeref from just reversing his own time to where it never happened. And if he activate Zero Eclipse, he can travel even a second back in time and Gil along with the current world and timeline are erased.
Or he can just go the more mundane route and stomp time to punch a whole through Gil’s head. Timestop from Zeref was demonstrated in the Tartaros arc