Blend Weight for Post Process

Hello,

I have 2 post process volumes overlapping my whole scene. One is day mode for the scene, the other is night. I want to fade between the two when the player presses a button. So say they press “A”, the blend weight fades down on day mode, and night mode fades up. I think this can be achieved with timelines, but i’m not advanced enough at blueprints yet to get this on my own, so still could use some guidance.

Thanks for any help