The API documentation mentions that you can filter a call to /tags by the modifiedTime. I've checked and you can also order the data by modifiedTime too (e.g. '&orderBy=modifiedTime%20DESC').
What I'd like to know is if there is anyway to actually pull out the tag's modified time. Currently a call to the /tags endpoint only returns the ID and the name (with printers and items being expandable), but no modifiedTime.
Any help would be appreciated.