You're correct. There is a delay. I'm keeping Mutiny open and it seems to take about 10 minutes. There is no need to confirm each transaction, unlike Alby. I believe a similar delay occurs with SN wallet. We just don't see it. 

I was under the impression the nostr event that tells Mutiny to zap gets sent immediately (and then Primal shows it was sent). But the next time you open Mutiny (unless it’s still running in the background, or running on another device), all of those payments actually get sent out (automatically, not needing to approve each one). Maybe I’m mistaken. Will have to test it out again. 

ACYK

I have not set up a federation. My mutiny wallet zaps immediately on primal. I don't have to go back to the wallet for each zap. 

siggy47

Using Mutiny For Zaps On SN? 

Without adding a federation, zaps don’t send until you return back to the Mutiny wallet. If you’re using a federation, do zaps send automatically (assuming they’re below your auto-approve budget)? Or is the case of needing to go back to the Mutiny app for them to send still how it works?