using Que as a heroku worker

Question

I am using https://github.com/chanks/que

I am having problem setting up que in heroku. I have setup web and worker process in heroku and I have these configurations:

config/initializers/que.rb

Que.wake_interval = 10.seconds
# Que.mode = (ENV['QUE_MODE'] or Rails.env.production? ? :async : :off).to_sym
Que.mode = :off
Que.worker_count = (ENV['QUE_WORKERS'] || 1)

Procfile

web: bin/rails server -p $PORT -e $RAILS_ENV
worker: bundle exec rake que:work

Previously, when I had only one web process in heroku and Que.mode = :async que was running successfully within same web process.

Now that I setup seperate worker process for it, I tried using Que.mode = :off and I can't see any que logs, and I can see all the failing jobs in que-web.

Please let me know what I am missing, and which Que.mode will be suitable in my configuration.

NOTE: I want to keep web and worker process seperate and worker should be responsible for running my que jobs only.