IPv6 became a draft standard in 1998, and did not officially lose the “draft” status until 2017.
Hurricane Electric launched their well-known IPv6 tunnel service in 2001.
Google has published IPv6 adoption stats since 2008. These stats consistently show a greater fraction of users are on IPv6 on the weekend, because it’s more common on mobile and home networks than office networks.
For a little historical context:
Unfortunately some ISPs are total garbage and don’t support IPv6 in 2023. Eg. https://lemmy.world/comment/269250