This is sum of current Switch stock situation:
"Finally, when asked if Nintendo has already solved Switch’s stock issues, Kimishima said that for the time being, as we enter the new year this still hasn’t been completely solved. Though in Japan, the situation is more along the lines where customers don’t have to wait multiple days, and if they can’t buy it in one store they can find the system at another. In other words, Switch still has its stock issues, but the situation has improved".