Steps to migrate MS 365 Office from a PC to an iMac, with OneDrive files

My wife’s small business is ditching its three employee PCs (Win 10 Pro) to move to three brand new iMacs.

Each PC has MS 365 Office connected to its own, separate OneDrive account. On each iMac, we will install MS 365 Office and connect it to each user’s pre-existing MS 365 Office account (same OneDrive user name and pw). But how do we make sure that all the existing files and OneDrive connection+setup move onto the iMac? What are the recommended steps?

Detail: When we first set up these PCs and their MS 365 + OneDrive accounts, we did NOT specifically designate which files should live in the OneDrive cloud and which should always stay on the PC. We just left that at the OneDrive default. Or maybe I made a few designations some years ago but have forgotten. Does this change your answer?

Follow-up question: When OneDrive starts up on each iMac, won’t it be looking for the same folder names that are currently “in” the OneDrive area on the PC? What pre-mapping or folder creation do I need to do on each iMac?

One more detail: The MS 365s are actually MS 365 Family, and the three employees are three of the six permitted users, with my wife being the principal owner-user. Does this change your answer?

And yet one more: I saw an article here about using Migration Assistant (which I have never used personally), but (a) that might migrate more from each PC than what we want and (b) there doesn't seem to be a way to limit Migration Assistant to moving only MS 365 Office and associated OneDrive.

Feel free to send me great links.

Many thanks!