Systems Manager can deploy OS updates to iOS 9+ and macOS 10.11+ devices on either an individual client basis or in bulk via a command on the Clients List. The OS Update command will cause the client to download the update and will prompt the user to "Update Now" or delay the update.
MDM OS Update Commands are only available for DEP Supervised iOS devices, or DEP enrolled and pushed Macs.
Updates can be deployed to individual iOS clients via a Live Tool on the Client Details Page:
Multiple clients can be commanded to update via the Command dropdown on the Client List page. Select the clients which you wish to update and select "Install available OS updates" from the Command drop-down menu: