If you are the notification recipients, I believe you have received the notification emails from the Business Central Admin Center.
Yes, Major update of Dynamics 365 Business Central 2020 release wave 2 (BC17) is available.
Now you can set update date for the each environment.
An update to version 17.0.16993.0 is available. Updates will begin on 10/29/2020. You may schedule a date for the update on the Update action list. Visit Business Central Updates for more information.
Hope this will help.