Meaning of jí shí:
jí shí
及时
Adjective
timely; at the right time
Tā zǒng néng jíshí wánchéng rènwù.
他总能及时完成任务。
He always completes tasks timely.
Adverb
promptly; without delay
Tā bìxū jíshí wánchéng gōngzuò.
他必须及时完成工作。
He must complete the work promptly.