https://www.pcgamer.com/stardew-valley-multiplayer-will-officially-launch-in-august/

The moment we have all been waiting for is finally (almost) upon us: Creator Eric Barone, aka ConcernedApe, announced today that the official Stardew Valley multiplayer update will be out on August 1.   

Barone said that the release version of the update won't feature any "significant changes" from the beta that's currently underway. "Just a few last-minute bug fixes," he tweeted. He also clarified that split-screen or couch co-op will not be supported.