https://www.flashscore.com/match/KQ09vyIN/#match-summary has audio for Liverpool vs. Leeds United that is in progress. I don't know where the audio is from, and I don't know if the audio is legal or violates NBCSN's rights. I don't know how many games Flash Score has audio for, but if you want to listen to games that aren't on TV without paying for Peacock or using a site that only exists to have illegal streams, Flash Score is an option.