@Michaelold-3023 , I notice we will upgrade the SQL version. Please go through the SQL upgrade article to make sure the migration can be successfully:
https://video2.skills-academy.com/en-us/sql/database-engine/install-windows/supported-version-and-edition-upgrades-version-15?view=sql-server-ver15
For the main steps we listed, I think it is OK. We can see more details in the following link:
https://video2.skills-academy.com/en-us/system-center/vmm/upgrade-vmm?view=sc-vmm-2019
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