Track progress of a frame in Cue Gui

I'm trying to find a way to report current frame progress to cueGui (using Pixar's Renderman in this case). I can run the render program with an argument that would print simple render stats per line to terminal, in the form of:

5%
10%
15%
....

Currently Open Cue logs will not display any of that progress until the program ends completely (renders the whole frame), so I can't really track progress for heavy frames.

It would be nice to have a way to make open cue read and report that "live", even thou the program has not finished processing yet. If this is possible at all, where should I customize code? can it print to a progress bar inside cuegui, or should I rely on text logs only ?

thank you.

Start by tracing how OpenCue reads and displays running render output in cuegui; the issue does not name specific files or tests. Determine how Renderman-style percentage lines could be consumed while a frame is still running and displayed as live progress, with completion reflected before the process exits.

Written by the indexing model from the issue text.