The pattern for games previously Japan only making it to Virtual Console/NSO since the Wii days is that it's either completely unaltered from it's original Japanese release or there was an localized version that was never officialy release till the opportunity arise, the reason Mother 3 wasn't localized because it was a text heavy game in a niche franchise on a console that was about to stop getting games altogether, for comparison, the less text heavy original GBA Rhythm Heaven also didn't get localized for the same reason
Simply put, going by this pattern, Mother 3 would never get on NSO outside of Japan, it's not a game where reading the text isn't important to the game, besides, Nintendo has never taken down the fan translation