on schedule   (TTS發音)

punctual； at the expected time在預定的時間

    If my train is on schedule， I will be home by nine o'clock. 若火車準點，我9點以前可以到家。

    If the meeting is not held on schedule， I'll have to leave without at tending it. 要是會議不準時舉行，我只好缺席了。