My bets on Israel, it will be over before you know it. They want to take out their nuclear capabilities and will do so in swift fashion. JMHO, your mileage may vary.
Israel will strike at the time most beneficial to the mission. Because Kerry and other Israel-haters populate the Biden Administration, I suspect the US will learn of the strikes as will the rest of us - on the morning news. Once the fighting has begun, and while the US blasts Israel in the UN as the aggressor, China and Russia will waste no time in furthering their own strategic goals. In short order, the US will be confronted with simultaneous shooting wars in the the Middle East, the South China Sea, and the Ukraine. If forced to choose, the Administration will come to the aid of the Ukraine, slow walk any assistance to Israel, and turn its back on Taiwan which will revert to Chinese control. Of course, Israel will be blamed for plunging the world into war.