There's a few posts on the forum with some good information in @Rizzla
My added suggestion is to check on sites such as Sammobile.com and when the Beta becomes available to you then if eligible it'll be in your Samsung Members App.
Please take into consideration that Beta's by their very nature are buggy and glitchy so I wouldn't advise to put this on your daily driver. i.e main phone.
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "