on time vs untimely

on time

adj

  • Punctual or according to schedule. 

prep

  • By installments, payments over a period of time. 

  • By a player's running out of time. 

  • Punctually or according to the schedule. 

untimely

adj

  • At an inopportune time. 

  • Early; premature. 

adv

  • Prematurely. 

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