List of waiters for AWS Transcribe

I found some reference related to waiters here: https://boto3.amazonaws.com/v1/documentation/api/latest/guide/clients.html#waiters

Just tried to get available waiters for Amazon Transcribe service using below code:

import boto3

transcribe = boto3.client('transcribe')

print(transcribe.waiter_names)

This function returned empty string and according to above link if a client does not have any waiters then it will return an empty list when accessing its waiter_names attribute. It looks that this service does not have any waiters at this moment.