Hi,
unfortunately, conda package for windows (or macos) is not available yet. I worked a bit on it but found hard to resolve the large dependency chain for OTB 
If you have an existing OTB installation, you should be able to access it inside your conda environment using PYTHONPATH (https://docs.python.org/3/using/windows.html#excursus-setting-environment-variables).
Regards,
Guillaume