Bombing runways is almost completely useless unless done on a daily basis, since the repairs can be done quickly and cheaper than the cost of whatever ballistic missile they use. Blowing up the airplanes in the hangars incurs an irrecoverable loss to the tune of a hundred million dollars give or take.
But even were Iran or anyone else to hit some expensive F-35 or similar NATO bullshit plane they will never confirm the loss officially or do so reluctantly weeks later; case in point, the whole F-16 debacle currently in Ukraine.
As far as we know there’s no UMPK kit for the 9000kg bombs.
Even if there were one, dropping such a load would require a TU-95 bomber which isn’t used in this conflict. Every glide bomb so far has been dropped by fighter aircraft whose weapon pylons support up to a maximum weight of 3000kg per pylon, dependent on the jet and particular hardpoint.
Besides, dropping several smaller warheads is in general more effective than one single massive one.
Edit: in case you want to see the preparation & deployment of the largest explosives (FAB-3000) currently used by Russia in Ukraine: https://old.reddit.com/r/UkraineRussiaReport/comments/1e2wb9y/ru_pov_fab3000_installation_and_delivery/