Curent Famitsu numbers:
Animal Crossing: 6.472.485
PS4: 9.296.048
It is likely PS5 will fall behind PS4 in Japan and AC is still in the Famitsu TOP 10 (current week at #2 after Momotaro, which turns out to be another evergreen title). So it seems likely AC will beat PS4 over time and therefore also PS5.