Updating Always On Availability Group server connected to Windows SQL Cluster
It will not react any different, it is the same way as you upgrade a cluster server (if you did that before). To minimize the downtime of your server make sure to set it up a manual failover. Then start with patching your secondary node after you finish that, do database consistency check, on your secondary and then failover the primary node to your secondary server (the updated server) and do the same exact process on the then primary, now secondary node. Once you finish the upgrade make sure to check the health status of the availability group and if fix if any suspended or not synchronized database on from the list of your availability database.