You can review the Capabilities metadata document to discover if an action supports asynchronous requests.
https://sam.spclouddave.com/SampleService/Sppid/V2/Capabilities/$metadata
In the SampleService, the RetrieveFileUri and RetrieveFileUris actions do not support asynchronous requests.
See Reports (OData+) or Parametric Filters (OData+) for examples of asynchronous execution.