about time vs none too soon

about time

adv
  • Far past the desired time. 

  • Close to the right time. 

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

none too soon

adv
  • Synonym of not a minute too soon 

How often have the words about time and none too soon occurred in a corpus of books? (source: Google Ngram Viewer )