GihHub tagged zip files don't have content length header

In one of my projects I’m downloading a tagged zip file from another repo, and that all works fine, but I’d like to add a progress bar, and for that, I’d need to know the size of the zip file.

When using wget --spider url on any tagged zip file on GitHub, the length is unspecified.

Using HEAD call on the zip file returns Content-Length of 0.

This is a question for GitHub engineers, not sure if this is the correct forum for this, but are there any plans on fixing this?