No, isn’t won’t go nuclear, they have probably already launched a pre-emptive strike on Hezbolla. There may be very little except smoke coming out of the ground in southern Lebanon in a few hours.
bear in mind that with newly upgraded B61 that the yields can be dialed way down. Would there even be a mission for this? Who can tell but this is a new capability and all this is public domain info. Added that this weapon may be something the new F35 can deploy. Nuclear no longer necissarily means massive air burst weapons.