I just finished spending 5 minutes monitoring a CW pileup on 5353 kHz (2023-01-13 around 0230z), I didn't copy the DX station but US stations I clearly monitored calling during that short time included N4PL, W1VC, N4RJ, KK9S, NQ8R and W3BGN. I heard several others but was unable to verify their callsigns multiple times as I was able to do with the stations listed above.
Last summer Canada received authorization to operate on 5351.5 to 5366.5 kHz in addition to the five fixed 60M frequencies so I'm assuming the US has now also issued the authorization but I can't find any reference to it on the ARRL web site, the 60M Wikipedia page or anywhere else. Does anyone have a link to the information?