How do you know the job has been completed by the GPU? If you can identity that, then you could use
How do you know the job has been completed by the GPU? If you can identity that, then you could use a DO - the queue (or directly) adds a job to the DO. The DO knows the status of the GPU tasks and only sends when the current one has finished. If you know roughly how long a task will take you can use a DO alarm to wake up and check the status
