I know we are working on some type of hooks feature but I'm not sure it is a traditional webhook functionality. Amiad Stern
If you sent the API command to push policy, you will get back a task-id that you can monitor with show task for progress-percentage and follow until 100% or failed.
If you are looking for on a policy push from SmartConsole to then send a HTTP POST somewhere automatically on completion I'm not sure this is available. I think currently something like a SNMP trap may be available from the gateway on policy change.