adverb, noun which may take the genitive case particle 'no'
on time; punctually; as scheduled
Used when something happens exactly at the planned time, without delay.
会議は時間通りに始まった。
The meeting started on time.
彼はいつも時間通りに来る。
He always comes punctually.
Compound of 時間 (time) + 通り (as, in accordance with).