Put it right after the promise in the edit, then follow it with a Bruh for disbelief or an Emotional Damage hit when the delay ruins the plan, keeping this line as the setup before the reaction lands.
O tym dźwięku
This is a short spoken Portuguese line, lasting just over two seconds, delivered in a casual, deadpan voice that sounds like a throwaway remark in the middle of a conversation. It lands as dry and knowing, the kind of clip that makes a promised arrival feel doubtful before anything else is said, and it works because the delivery stays flat while the meaning does the joking.