IIRC, they plan to deploy IPv6 in 2020 spring. Unfortunately I can't remember the source.

And they've had it in few select residential areas as a trial since 2018 autumn [1].

[1]: https://www.dslreports.com/forum/r32136440-Networking-IPv6-w...

Small local player. But they posted on twitter in 2016 that their network is technically ready. Apparently finding the ON switch takes years