As of a check about two minutes ago, US (and UA) only show today's flights (7/22) to TLV canceled. 7/23 flights show 'on time'. I realize (and probably expect) this may change, but have not seen press releases from US (or UA) regarding suspension of service "until further notice" like DL put out (yet).
(That said, DL's flight for tomorrow is also showing on time still, so I think they all may still be figuring it out)
It appears US has a plane on the ground in TLV. The 7/21 departure of 796 arrived today (7/22) but the return 797 has been canceled.