As we all know that Wave 2 is release for preview and here are the steps to be followed to update your instances.
1) Visit Power Platform Admin Center
2) Select the environment which you would like to enable for the 2020 wave 1 updates
3) You will see a button as Manage on the left hand side.
4) Click on that button and window would open on the left side, click on Update Now.
It takes sometime to activate. The 2020 release wave 1 update is activated for the Dynamics 365 platform, Dynamics 365 Sales, Customer Service, Sales Hub, Customer Service Hub, and Marketing.
Hope this helps.