How to run checkov scan on terraform plan

Terraform
1

I would like to have checkov scan terraform plan output but I am not getting any success with that.Below is my code in terragrunt.hcl,GitHub Actions workflow and the message I got when my workflow completed.Any help will be appreciated.

terragrunt.hcl

terraform {
  after_hook "after_hook_plan" {
      commands     = ["plan"]
      execute      = ["sh", "-c", "terraform show -json tfplan.binary > ${get_parent_terragrunt_dir()}/plan.json"]
  }
}

GitHubActions Workflow

name: 'Checkov Security Scan'
on:
  push:
    branches:
      - test

jobs:
  Terraform:
    name: 'Terraform'
    runs-on: ubuntu-latest

    defaults:
      run:
        working-directory: ${{ env.tf_working_dir }}

    steps:
      - name: 'checkout'
        uses: actions/checkout@v2

      - name: configure AWS credentials
        uses: aws-actions/configure-aws-credentials@master
        with:
          aws-region: us-east-1
          role-to-assume: ${{ env.dev_role_arn }}

      - name: Setup Terraform
        uses: hashicorp/setup-terraform@v1.3.2
        with:
          terraform_version: ${{ env.tf_version }}
          terraform_wrapper: true

      - name: Setup Terragrunt
        uses: autero1/action-terragrunt@v1.1.0
        with:
          terragrunt_version: ${{ env.tg_version }}
         
      - name: Init
        id: init
        run: |
          terragrunt run-all init --terragrunt-non-interactive
      - name: Plan
        id: plan
        run: |
          terragrunt run-all plan -out=tfplan.binary -no-color --terragrunt-non-interactive
      - name: 'Test Plan (Checkov)'
        uses: bridgecrewio/checkov-action@master
        with:
          directory: ./applied/test/
          quiet: false # optional: display only failed checks
          framework: terraform # optional: run only on a specific infrastructure {cloudformation,terraform,kubernetes,all}
          output_format: json # optional: the output format, one of: cli, json, junitxml, github_failed_only

checkov output message
{
    "passed": 0,
    "failed": 0,
    "skipped": 0,
    "parsing_errors": 0,
    "resource_count": 0,
    "checkov_version": "2.0.706"
2

IMHO, checkov should be executed in a different directory.