Once it appears in the Samsung Members App you'll be able to apply to become a Beta tester for it and then if your accepted you'll be enrolled and sent information and instructions.
However as Beta is by it's very nature unstable at times and can break features / services in your phone throughout the Beta Programme I'd suggest to not put this on your daily driver.
Best of luck.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.