Show Current Wizard Progress to User

1. your_wizard_controller.rb:

  before_action :set_progress, only: [:show]
  private
    def set_progress
      if wizard_steps.any? && wizard_steps.index(step).present?
        @progress = ((wizard_steps.index(step) + 1).to_d / wizard_steps.count.to_d) * 100
      else
        @progress = 0
      end
    end

2. your_wizard_view.html.haml: (using bootstrap + haml)

  .progress
    .progress-bar{style: "width: #{@progress}%"}