on time
on time {adv.} or {adj. phr.}
1. At the time arranged; not late; promptly.
The train left on time.
Mary is always on time for an appointment.
2. On the installment plan; on credit, paying a little at a time.
John bought a car on time.
You can buy things at the department store on time.
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Source: A Dictionary of American Idioms