about time

(also high time)

If it is about time/high time that someone did something, it should have been done sooner or a long time ago.

差不多是时候了;早该(做某事)了

It's about time (that) the school improved its food service. 学校早该改善膳食服务了。

A: Here's the letter you asked me to write.

这是你让我写的信。

B: It's about time! I asked you for that ages ago!

早该给我了!我老早之前就叫你去写了!

A: Sorry.

抱歉