It looks like W3CSW (5886km) was the last stateside station to spot my 500mW 10m WSPR beacon today at 1654z. The stateside 10m openings are definitely shorter now. Since then, just locals G4IKZ and G0LRD have been spotting me. There could conceivably be further reports from North America, but this is unlikely today. It has been dark here for 2 hours. The time is 1820z as I write.
UPDATE 1936z: No more WSPR spots from the USA since 1654z. This was the last USA WSPR spot today.