On December 10, the Ranked Choice Voting Act was introduced into both houses of Congress. There are no bill numbers yet. Here is the text. It requires that all congressional primaries and general elecdtions use RCV.
In the case of states with a top-two system, the bill says that the law must allow at least three candidates to advance to the general election.
The bills have a fair number of co-sponsors so far. All are Democrats or independents.