Run script from Windows command prompt with open Rhino

Rhino Rhino for Windows
2

If you do not at all to start Rhino, but use its geometry computation you can use CPython3.x modules rhino3dm and compute-rhino3d

https://discourse.mcneel.com/c/serengeti/rhino3dm
https://discourse.mcneel.com/c/serengeti/compute-rhino3d