Hey Brian! We did have issues in the past where meetings created via Teams were not being detected/reflected in the appointments themselves and we made improvements to better handle those. So, while I can't comment on the Teams functionality IN Outlook itself, I can say that once you have it working we should detect it as you would expect.
I do recommend setting up a test environment for them as Zach noted so they can take it for a spin though, that'll be your best bet for confirming everything they're looking for is present. If you can get them to put together a list of functionality they're looking for - and a basic use-case in how they use that functionality - you should be able to set up a demo environment for them pretty quickly.
As always let us know if you need a hand!