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Can we create a task which runs before the flow ends, when all upstream task are successful. (without mentioning all upstream tasks name)

I think you really need to either use `set_upstream` or `set_downstream` with the other tasks because if there is no dependency set, then it can be run in parallel. What does this task do? Your other option is to use a <https://docs.prefect.io/core/concepts/notifications.html#state-handlers|State Handler> and run some code before the Flow ends but this is not a task

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Here is my flow, with all upstreams task defined. When this whole flow is completed and marked successfull i want to shutdown my machine.

is there any way i can create a task which only runs at the end of flow when all task are successful.

Not really. You can use a state handler for that. Ot you can use a <https://docs.prefect.io/core/idioms/resource-manager.html#managing-temporary-resources|resource manager> and still will just down when all of those complete