If that's the worst (or only) thing Iran can do, this is likely a good sign for generally high-quality IT security. If they could e.g. take out any of the US power grids, why wouldn't they have done so already? The current conflict is pretty existential for that government already, I think.
It is almost certainly not the worst. And with the reckless/wanton damage the US is doing to civilian infrastructure in Iran, I think the only sane position is to brace for something much worse, inevitably. The CIA and many independent researchers have extensively documented the vulnerabilities in US infrastructure; from SCaDA/ICS, electrical grid, food, municipal/dams/etc, GPS (remember the drones?) and other system…
We should have critical infrastructure secured whether or not Iran gets super mega big mad.
It's like when the guy taunted the tiger at the SF zoo and then it turned out the tiger could make it over the wall if it was sufficiently pissed off. Not the way to design any of this.