As of yesterday morning, the first day after the completion of the World Series, MLB teams can officially make trades once again, following a period of inaction started by the July 31 trade deadline. In general, several smaller trades will occur throughout the first week of the offseason involving players with team or club options which have to be exercised prior to the fifth day after the World Series. The Brewers made such a move back in 2023 when they traded Mark Canha to the Detroit Tigers instead of picking up his $11.5 million club option.
Blockbuster deals, like the one that would involve the Brewers moving on from their ace, Freddy Peralta, generally don't occur until later in the offseason.