How is “be home and dry” used?

In Alita: Battle Angel (2019), one line is: “We'll be home free.”

Which movie is “be home and dry” from?

The clip at the top of this page is from Alita: Battle Angel (2019).

We'll be home free.

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to have done sth successfully, especially when it was difficult

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オックスフォード映画の 100%
to have done sth successfully, especially when it was difficult
-And I thought we were home free. -Yeah.
I just have to dot the I's and cross the T's, and I am home free.

定義：Oxford Advanced Learner's Dictionary 第 9 版