The Iran-Saudi talks have been overstated in American media. All they really are is the reopening of diplomatic communications between Iran and the KSA (aka a return to the 2014-15 time period) [0][1]. In essence, it's Saudi admitting they lost the War in Yemen [4] (which btw was projected to occur around now years ago) [5]
The core Saudi-Iran national security concerns continue to persist with continued conflicts between both countries partners inside Iraq, Syria, and Yemen. [0][1]
The moment Iran gets the bomb, Saudi and the UAE would readily enter a hot war with Iran. This is a big reason the KSA and UAE are pushing forward defense pacts with Israel [2][3]