Hi.
I didnt fully understand the issue here could you elaborate?
if this is the use case as I understood it:
The flow you wrote, it sounds like you are looking to make airbyte like apache airflow that will orchestrate jobs.
This is not what airbyte is for nor it`s API.
If you want to get some response once the connection sync is done you can check it`s status each X sec, min etc.. via the API, but passing metadata is usually used via apache airflow, luigi, perfect etc... tech