on schedule

on schedule idiom
At the announced or expected time, as in Her first baby arrived right on schedule. Originally alluding to published railroad timetables, this expression dates from the late 1800s.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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