The last USA station spotted here on 10m this evening was at 1902z and that was KZ8C. There may be others later, but at the moment that looks like it for the day.
EA7KZ is still coming in (Es?) at 2000z and I suspect will be coming through for a while yet.
UPDATE 2040z: Well I was wrong as K9AN was spotted at -24dB S/N at 2038z. A few minutes later quite a few North Americans were spotting me. The opening to the USA and Canada is far from over. The band may have been late coming to life, but it is good now. 10m - another magic band.