I think they have plenty.
I doubt it will come to nukes.
I hope it doesn't come to nukes . . . I suppose Israel has enough other weapons to take out most of those backwards countries.
Best guesses say Israel has 200 warheads, estimates range from 150 to 400. My guess say mostly 100 to 450 kt designs, enough to take the heart of a city, probably not the outskirts via blast effect.
Nuclear weapons will only come into play if Israel is backed into a corner, unlikely at present, or if Iranian missiles open containment or storage areas at Dimona. That's probably not on the menu now, not for the next 24 to 48 hours at any rate.
Syria would have to make overt military moves, or upgrade the rhetoric indicating they are ready to fight before Israel will move on Syria. There are other, less likely scenarios.
After Israel hypothetically attacks Syria, Iran will take an indeterminate period of time to coordinate and execute any respoinse, with notable mouthpieces flapping all the while. They could go totally silent too, that would not be a good sign. Right now, vacuous Syrian and Iranian threats, "we will support..." , "evil Israelis", we promise a stinging response if..." are in effect good news.