How much damage:
24 Israelis have died so far. All within the first 48 hours.
According to Janes, Iraq fired ~200 ballistic missiles (roughly equivalent to first 24 hours on Israel) on Iranian cities, causing >2,000 deaths.
This demonstrates how a combination of air defenses, public shelters and mandated bomb proof areas in every building, and culture of adherence to safety instructions, can create an exceptionally resilient home front.
It is thus safe to conclude that most of the damage is behind us.
Everything else like buildings and other stuff is just material, which literally can just be bought.
Iran can probably import missiles that will allow them to trickle fire MRBMs on Israel on the same level as the Houthis, something we'd consider a victory.
Iran hasn't fired its cruise missiles yet. Only MRBMs and drones. I suspect these are reserved for another target.
It's very difficult to saturate Israeli air defenses with something as basic as a cruise missile or a drone.
They launch drones probably because it's cheap enough. But cruise missiles are more expensive, and will be better utilized against something with more limited defenses, like a ship, or a base. Or civilian targets related to local energy trade.