@Kevin_C 

One more question:

I found this page: https://quickbooks.intuit.com/learn-support/en-us/help-article/update-products/release-notes-quickbo...

that mentions Release 13 (R13) 3/15/23 for QuickBooks Desktop for Mac 2021.

It says:
"Calendar and Reminders Updated Mac OS Calendar and Reminders support for Mac OS version 12 (Monterey) and Mac OS version 13 (Ventura).", but it doesn't mention macOS Sonoma.  

Is that because macOS Sonoma is compatible with QuickBooks Desktop for Mac 2021and it did not need any updates for Sonoma?

This is what I am going to be doing...

I am making sure that my QuickBooks Desktop for Mac 2021 is fully up to date with updates.

Then, I will upgrade my macOS to Sonoma, and once that's done,  I will start QuickBooks Desktop for Mac 2021 on my computer again to continue using QuickBooks Desktop for Mac 2021 under macOS Sonoma.  

I shouldn't need to activate my Quickbooks again since it's on my same computer.  That should work fine, correct?

Thanks