It's romantic to think of big heat ending with an exit big bang ... but, she seldom shows up.
The reason for that is because as is typically the case, the front that demarcates the surface end of the heat wave, parallels the flow - typically still having heat wave CIN layer cap. This mollifies instability while also doesn't provide triggers. The result is that it just sort of goes away.
It's progress in displacing the heat is in lockstep with the speed of the height decay aloft. As the ridge recedes, the front is repositioning accordingly.
You can see that happening here. WSW-ENE oriented front side-winding slowly south, as the ridge is deflating - booorinnng
We just find our selves in a different world tomorrow with severe drizzle to show for the giant change.