This would be great, but unfortunately we can’t get the information faster than third parties are willing to provide it to us. We would also be limited to “polling” for the data a maximum of 4 times per day. For this reason I don’t think we’ll ever see Monzo-style real-time notifications for third party providers, unless they choose to implement webhooks.
I can see us implementing something like this as a native feature in Monzo, but not through IFTTT as they aren’t a payment initiation service provider 