Thanks for your purchase!
Yes, I plan to support UE 5.8. I'm currently working on a feature update for the shader on 5.7, and once that's finished, I'll verify everything on UE 5.8.
If there are no compatibility issues, I'll release both a UE 5.7 package and a UE 5.8 package so users can simply download the version that matches their engine.
I'll post an update as soon as the testing is complete. Thanks for your patience!