Install client from SEPM to Big Sur Mac system.
1. No indication of client to reboot until open the GUI and it displays message to reboot
2. When view status on client on SEPM, via clients TAB, deployment message says installed by does not mention reboot required.
Normally a client push does not require a reboot.
A development defect has been raised on this issue. If you are seeing this issue, please create a Support case and reference this article.