ところだよ

just did; be in the middle of doing

→ 所
phrase Rare #21,922
just did; be in the middle of doing Used after a verb to emphasize that an action has just been completed or is currently in progress. The form before ところ indicates the timing: past form for “just did” and ている form for “be in the middle of doing.” だよ is casual; the polite form is ところですよ.
JA: 今、昼ご飯を食べているところだよ。
EN: I'm in the middle of eating lunch.

今日ボストンから帰ってきたところだよ

I just got back from Boston today.

調べているところだよ

I'm looking into it now.

ちょうど爪を切ったところだよ

I just clipped my nails.

ちょうど今その問題を考えてたところだよ

I was just thinking about that problem.

今日君は来るのかなと思っていたところだよ

I was just wondering if you'd be coming today.

ちょうど太陽が沈むところだよ

The sun is just setting.

勉強してるところだよ

I'm studying right now.