not a minute too soon

Adverb

idiomatic

(idiomatic) at the last possible moment; just in time / (idiomatic) after an undesirable delay; undesirably late

Japanese Meaning

最後の寸前に、ぴったりのタイミングでやってくる / 一分遅れても遅すぎる、極めてタイミングが大事な状況を示す

She submitted the budget proposal not a minute too soon, just as the committee was closing submissions.

委員会が提出を締め切ろうとしたちょうどそのとき、彼女はぎりぎりで予算案を提出した。

Sense（1）

(idiomatic) at the last possible moment; just in time

Sense（2）

(idiomatic) after an undesirable delay; undesirably late

She finally dumped her jerk boyfriend, and not a minute too soon