Is "Time waiting for runner" available in the API anywhere?

I’m setting up CI for a GitLab.com project using our own group runners. I’m in the middle of optimizing the number of runners we use and it would be helpful to have some more data.

Is there a way to query the GitLab API to determine how much time a job spent waiting to be picked up by a runner?

This would help me determine whether or not we need to spin up more runners