Steve Jones reminds you to check those cumulative updates:
How can I quickly get a CU patch for a system that’s out of date? I’ll discuss that situation.
You might think you get to patch every instance every few months, and you may be able to. But most of us have laggards in any decent-sized estate. Someone always wants to avoid patching, or skip patching on the day you’ve scheduled every other system.
Steve’s solution involves using Redgate Monitor, though you could also do this on your own or using something like dbatools to get information about your estate.