Alexandra Del Rosario Associate Editor/Nights & WeekendsWith brand new COVID-19 measures and guidelines, Mom season 8 is finally underway.“Hi everyone, we are all back at Mom on our first day with the new COVID protocol,” a masked Allison Janney says in a Twitter video. “Everyone’s here and it’s a whole new territory but we’re excited for season 8 to begin.”Janney posted the behind-the-scenes look at the CBS show’s return to set on Monday.