How is “be in on the act” used?

In Everest (2015), one line is: “Yeah, it didn't take you too long to get in on the act.”

Which movie is “be in on the act” from?

The clip at the top of this page is from Everest (2015).

to be / become involved in an activity that sb else has started, especially to get sth for yourself

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to be / become involved in an activity that sb else has started, especially to get sth for yourself
Yeah, it didn't take you too long to get in on the act.
And eventually, I even got them - in on the act. - Son of bitch!

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

Yeah, it didn't take you too long to get in on the act.

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