"马上下班了" 的英语表达是 "It's time to get off work soon." 或者 "It's almost time to leave work." 这个表达的来源可能源于人们日常工作生活中对时间的描述，即在工作时间快结束的时候会用这样的表达来表示。

例句：

It's time to get off work soon. 我们快下班了。

It's almost time to leave work. 我们差不多要下班了。

I can't wait to get off work and go home. 我迫不及待地想等到下班回家。

I'm ready to clock out and start the weekend. 我已经准备好打卡下班了，开始周末的活动。