Steps to apply windows updates to sql failover cluster?
You do not need to stop any jobs or services to manually failover. Please see the Microsoft Docs - Perform a Forced Manual Failover on manually failing over.
These are the general steps you should follow for applying any updates to your failover cluster instances:

Backup all databases.
Failover all SQL cluster roles to Node A.
Install the patches on Node B (passive).
Restart Node B.
Failover all SQL cluster roles to Node B.
Install the patches on Node A (passive).
Restart Node A

More information on the installing updates process can be found in these Microsoft Docs - Upgrade a failover cluster instance.