How to run this task with delayed_job

Controller

# fetchs SIB Account information
    def sib_account_fetch
      sib = Mailin.new("API_URL","API_KEY")
      acct = sib.get_account()
      acct.dig('data')
      credits = acct.dig('data', 0).to_h
      SibAccount.find(1).update_attributes(credits)
      details = acct.dig('data', 2).to_h
      SibAccount.find(1).update_attributes(details).delay

      redirect_to(:controller => 'monet', :action => 'refresh')
      flash[:notice] = "Account Info updated successfully."
    end

credit_fetcher.rb

class CreditFetcher
  def run
    sib = Mailin.new("API_URL","API_KEY")
    acct = sib.get_account()
    acct.dig('data')
    credits = acct.dig('data', 0).to_h
    SibAccount.find(1).update_attributes(credits)
    details = acct.dig('data', 2).to_h
    SibAccount.find(1).update_attributes(details).delay
  end
 end