How can I record and and view a log of my activity in MS Word 365? I am trying to find a way to passively track my time spent on different projects.

I want it to include every time I opened and saved a file throughout the day. Obviously, this would include multiple saves for a single file throughout any session. Ideally, the log would include the name of each file that was being used. TIA!

You could do this with vba.
Or, you could simply open a file and add time stamps and notes yourself.
Date Stamp (Text) Shortcuts Add-In (adds date as text in document rather than field with keyboard shortcut)