I thought I saw that as episode 11? I don't think a summary has been announced for the finale (episode 12). The link below is what I usually use for the episode summaries/names (minor spoilers, it's just the cable description):
this is actually from a book called Marriage vacation
"In season four of Darren Star’s hit TV Land series Younger, the editors at Empirical Press are shocked and deeply moved when they read Marriage Vacation, an autobiographical novel by the publisher’s estranged wife, Pauline Turner Brooks. Knowing the book will cause a sensation, they decide they must publish it. Now you can read what the hype is about—including page 58 that had everyone buzzing (...and blushing)."