at the eleventh hour　
在最后一刻

Thank God, you're here. I thought you might not be able to make it.
（感谢上帝，你终于来了。我还以为你到不了了。）
I looked everywhere to find my passport. Then I found it at the eleventh hour.
（我到处找我的护照。终于在最后一刻找到了。）