ETA on Northeast Asia regions

Can I get any ETAs on Northeast Asia regions such as ap-northeast-1 (Tokyo) and ap-northeast-2 (Seoul)?

We are very willing to use Neon for our production workloads, but not having Seoul region blocks it.

The current closest region, Singapore, has round-trip latency of ~200ms from Korea which most of our user base resides, makes it hard to use as our primary data source.

We would use Neon without any hesitation if we have the Seoul region (~10ms latency), or at least the Tokyo region (~40ms latency). Any ETAs would be useful to us evaluating.