Covid PCR test within 72 hours before entering Japan is not required after 7 Sep. 2022 who got proper vaccine 3 times.
But, the proper visa is still requested for most countries and it may take time to obtain a visa.
And, Japanese government has increased the daily entry limit from 20,000 to 50,000.
Ref (in Japanese) :
on 6 September, by Ministry of Foreign Affairs (MOF)