about time vs just now

about time

adv
  • Close to the right time. 

  • Far past the desired time. 

  • Used other than figuratively or idiomatically: see about, time. 

just now

adv
  • Very close to the present moment; just a moment ago. 

  • At present; now. 

  • In a little while. 

How often have the words about time and just now occurred in a corpus of books? (source: Google Ngram Viewer )