Can mac upgrades requiring reboots be postponed/deferred in SEP Cloud?
Can I delay the restart on MacOS when there is a scheduled update?
Can Mac upgrades requiring reboots in SEPC be postponed or deferred?
How to postpone Mac upgrades requiring reboot in SEPC.
This setting is determined by macOS notification settings.
While your system policy dictates when the update gets to the client, and will let you delay the upgrade from hitting the client, once that update does hit the client, the notification can still be postponed indefinitely by the end user as seen in the images below :