https://www.kitguru.net/gaming/matthew-wilson/half-life-remake-black-mesa-enters-complete-beta-with-all-content-available/
 
As announced by the Crowbar Collective over the weekend, the Black Mesa Complete Beta is now live on the public beta channel on Steam. All you need to do is opt-in to the beta within Steam and you will be able to play the complete remake from start to finish for the first time with no content missing. 
 
There are still some known issues with the game. Currently, the developers are concerned that some portions may be too difficult or too easy, so they are monitoring feedback on that prior to the full 1.0 release in 2020. Performance across the game has also improved with recent updates but there are still certain areas that may need further optimisation to bring frame rates up. Finally, while the team doesn’t expect any progression blocking bugs, players may find creative ways to break the factory maps, so there is still some more work to be done based on player feedback.
 

Oh, was wondering what the state of Black Mesa was, thanks for the update!
 
Beta or not I guess I'll be playing this one before the winter Steam sale kicks off.