Temporal is about to reach stage 4
People who have been waiting for the Temporal proposal, and for browsers to release their implementations unprefixed, have reason to be happy :)
Now, short of major implementation issues reported to TC39, this should move to stage 4 once two interoperable implementations ship in browsers.
Using the Temporal polyfill provides a spec-compliant workaround for the API until browsers implement it natively.
I discussed using the polyfill along with examples of how the API works in Revisiting the TC39 Temporal proposal