How to manually Trigger Policy

Hello, I am trying to setup policy to delete indexes older than 90 days. But it does not seem to do anythinhg. It is been created 30 mins ago, so in what intervals policies gets checked? how can I manually trigger it?

I see that I need to attach existing indices to policy by calling:

POST _plugins/_ism/add/index-pattern-*
  "policy_id": "test"

What then? I see says “Still initializing”.I think I have to wait but why it takes this long? I have simple delete.

Update: all indices initialised, but transition does not happen, there is a interval ?