The Software Update Manager guide for the specific scenario also contains activities that have to be considered after the Software Update Manager procedure has finished.
The Software Update Manager guide can be found at support.sap.com/sltoolset.
Software Update Manager can generate the loads for the ABAP programs automatically during uptime. If this option is not chosen for the Software Update Manager run, the generation of the ABAP loads via the transaction SGEN should be considered before opening the SAP system for the users. The load generation then takes place during business downtime.