A Progress object looks like:

{
  // the ID of the Progress object
  "id": 1,
  // the context owning the job.
  "context_id": 1,
  "context_type": "Assignment",
  // the id of the user who started the job
  "user_id": 123,
  // percent completed
  "completion": 100,
  // the state of the job one of 'queued', 'running', 'completed', 'failed'
  "workflow_state": "completed",
  // the time the job was created
  "created_at": "2013-01-15T15:00:00Z",
  // the time the job was last updated
  "updated_at": "2013-01-15T15:04:00Z",
  // for successfully completed jobs, this is a JSON object containing url of the
  // report and other details
  "results": {"url":"https:\/\/canvas.example.edu\/api\/assignments\/1\/files\/2\/download"},
  // url where a progress update can be retrieved
  "url": "https://canvas.example.edu/api/v1/progress/1"
}