Hi!
I implemented the render progress callbacks as explained in the documentation for RenderDocument() to print updates to a commandline render and it seems the callback doesn't work for Redshift renders.
Instead of c4d.RENDERPROGRESSTYPE_DURINGRENDERING
the function gives c4d.RENDERPROGRESSTYPE_AFTERRENDERING
for every call.
There is also some funky formatting going on at the bottom of the documentation entry.