になってやっと

not until

→ に
phrase Rare #30,308
not until Emphasizes that something finally happened or became known only at a particular time.
JA: 夜になってやっと宿に着いた。
EN: I didn’t reach the inn until night.

今朝になってやっと雨がやんだ。

The rain finally stopped this morning.

きのうになってやっと私たちはそのことを知った。

It wasn't until yesterday that we finally found out about it.

昨日になってやっとその事実を知りました。

It wasn't until yesterday that I finally learned that fact.

彼女は最近になってやっと彼に会った。

She only just met him recently.

昨夜になってやっと知らせが届いた。

I didn't finally get the news until last night.

夜になってやっと山のふもとへたどり着いた。

It wasn't until nightfall that I finally reached the foot of the mountain.