Bad news for Oculus Rift CV1 and Oculus Rift S users. Such popular games like Beat Saber, Superhot and Moss announced that they will not support Cross-Buy on Oculus Quest. This mean, that if you already bought game on Oculus Rift headset, you will need buy this game one more time separately for Oculus Quest headset. Main reason - Oculus Quest is a little bit different platform and developers spend their time and money to support games on this headset. This is normal becouse all companies want earn money, continue grow, develop new and funny games in future.
Oculus Quest glasses will be released on 21.05.2019. By some reason release date on official website changed from 21.05 to 30.05. For now there are no any information about why it's happens.
Full game list which will be supported by Oculus Quest you can find here.