Based on the search results, it is unclear which episode of Yellowstone is on tonight. Some sources mention that there wont be a new episode of Yellowstone tonight, and instead, a rerun of the Season 1 finale will air on CBS. Other sources mention that two episodes from the first season of Yellowstone aired on CBS on October 15, 2023. However, it is not clear if these episodes will air again tonight. It is recommended to check local TV listings or streaming services to determine which episode of Yellowstone is on tonight.