about time vs not a minute too soon

about time

adv
  • Close to the right time. 

  • Far past the desired time. 

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

not a minute too soon

adv
  • at the last possible moment; just in time 

  • after an undesirable delay; undesirably late 

How often have the words about time and not a minute too soon occurred in a corpus of books? (source: Google Ngram Viewer )