As far as passage I find it unlikely that Isreal is going to run into strong opposition other then verbal condemnation from those whose air space was violated.

Follow up action maybe, but not day 1.

You don't get it at all , it involves 3 countries that are still at war with Israel and a countryy which as part of the peace deal says that Israeli planes can bugger off if they think they can overfly at all .
Are they planning a one way journey perhaps ?
Given the spread and depth of Iranian fascilities even if they go round and come over the sea to avoid early warnings they are still going to have to take out the air defence network before they have a hope of getting to the nuke stuff . Israel simply hasn't got the capacity to do it .
It isn't a matter of day 1 at all . And you can guarantee that on day one Isreali towns and villages will be recieving lots of presents of the non verbal kind from Irans little buddies .
Israel simply cannot do it without US assistance and US assistance means saying goodbye to the entire middle east network apart from Isreal .