■ go off work 会社を出る　　
ex) My wife wants me to go off work earlier today.
妻は、私に早目に会社を出てほしい

go off: to leave a place and go somewhere else
ex) She's gone off on holiday with her sister.
彼女は妹と 休暇で外出している

■ knock off work 仕事を終える
ex) I knock off work at 6 p.m. every day, and occasionally I hit the gym on the way back home.
毎日 午後６時に仕事を終え、たまに帰宅途中に スポーツジムに寄る

knock off: to stop doing something (such as work)
ex) I'm going to knock off work early so I can pack for my trip tomorrow.
仕事を早めに終えるので、明日からの旅行の荷造りができます

■ get off work　　仕事を終える
ex) I don't get off work till 6p.m. Then I go home to wind down and work on dinner.
６時まで仕事を続ける。　それから自宅でリラックスし、夕食の準備に取りかかる

get off work: to leave work with permission, usually at the end of the day
ex) How early can you get off this afternoon?
今日の午後は どれ位早く 仕事を終えられますか？

■ punch out 仕事を終えてタイムカードを押す
ex) I can't punch out until the work is done.
その仕事を終えるまで、帰れない

punch out: to stop work, especially by recording the time that you leave work on a special machine
ex) Workers are kicking mud off their shoes and punching out at the construction trailer.
労働者たちは 靴の泥を落として、建設現場のトレーラーの仕事を終えた

■ have left for the day （その日の仕事を終えて）会社を出た = have left for the evening
ex) Has she already left for the day?
彼女はもうすでに 会社を出ましたか？

for the day: Starting now and continuing until the day ends. It can also refer to the remaining time in a school or work day
ex) After you finish work for the day, how do you spend your free time?
その日の仕事を終えて会社を出た後、どのように自由時間を過ごしますか？