you could query your tablo for exact minute - substituting the IP or local name of your tablo for tabloIP:
http://tabloIP:8885/server/guide/status
it will return some JSON data with the time in UTC, you’ll need to calculate to local time. Some browsers, like Firefox formats JSON so you can easily read it. There are command line tool as well.
TabloTV says it’s a popular request for years… but I’m guessing it’s not a profitable feature they can market to justify investing the time.