How to run delayed job in CI/CD?

I have a GitLab CI where I need to run integration tests after ECS deployment; the rolling update takes roughly 10 minutes.

Based on the documentation `.gitlab-ci.yml` keyword reference | GitLab there is a delayed option, I get the below error in my project. Any idea how to resolve this?

jobs:run integration tests config contains unknown keys: start_in
jobs:run integration tests when should be one of: on_success, on_failure, always, manual


Can you share the bit of the .gitlab-ci.yml file showing the job in question?

-James H, GitLab Product Manager, Verify:Pipeline Execution