"Final passage" refers to the last step in the process of approving or passing a law or bill. It means that the law or bill has been successfully adopted and has become official. Full definition
And I will note that the movie's final passage focuses on an urgent question — Is romance worth all you have to sacrifice for it? (firstthings.com)
We hope that they will eventually vote for final passage of health care reform that closely mirrors the values contained in HR 3962. (readme.readmedia.com)
Texas Rep. Pete Olson, seen here at a Wednesday press conference, was among the 21 of 25 Texas Republicans to vote for final passage of the Hurricane Harvey relief measure. (rollcall.com)