I can say for certain when I’m done. 


A: You look busy. Can I help you?
B: Thank you, but it’s OK because I can say for certain when I’m done.
A: OK, do your best! When is the deadline?
B: By the end of today.

In this situation, what should you say ‘I can say for certain when I’m done.’ in Japanese?

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B:ありがとうございます。でも、目途めどが立たっているので大丈夫だいじょうぶです。

Note: This is not a word-for-word translation.


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A word-for-word translation

B:でも、いつ終おわるかはっきりわかっているので大丈夫だいじょうぶです。

It’s grammatically correct, but we don’t usually say that.

We usually say 目途めどが立たつ.
目途めど means ‘goal’ and 立たつ means ‘stand’ or can mean ‘put up’ in this context.
Imagine the pole as the finish line of a race is put up and you can see it.
In this situation, you can estimate the time it will take to reach the pole.
So, 目途めどが立たつ indicates the situation where you can say when you’re done.

We also use the following expressions for ‘I can say for certain when I’m done,’

見通みとおしが立たっている

終おわりが見みえている

目途めどがつく