Eleventh hour

If she repented, though at the eleventh hour, it was not too late.

Source: wiktionary

Highly providential was the appearance on the scene of Corny Kelleher when Stephen was blissfully unconscious but for that man in the gap turning up at the eleventh hour the finish might have been that he might have been a candidate for the accident ward […]

Source: wiktionary

I have extricated myself so far at many eleventh hours and perhaps there is some hope in this.

Source: wiktionary

Egypt had managed to bring the two sides to the brink of a deal two weeks ago, before internal political dynamics prompted the Israelis to back out at the eleventh hour.

Source: wiktionary