How do I output execution time for the Rhasspy Dockered Piper and Whisper models?

I started using the Piper and Whisper Docker images here. Currently, I run them on CPU and I am trying to find a good trade-off between error-rate and execution time.

But I am unable to find out how to output the execution times for either of the two models. Is there a way to do this?

I tried the --debug option, but for both this does not output the execution time…

Thanks in advance!