First check how many workflows are running in the production system
How many instances of workflow are in error state?
Check how many custom workflows and BO s in the system
Test each workflow with all the possible test scenarios
After completion of the upgrade process, maintain all the required configurations in SWU3.
Check all the necessary workflows are active or not in tcode SWE2 or SWETYPV.
Check the start conditions of the workflows in SWB_COND
Run Buffer Synchronization transaction SWU_OBUF