Unfortunately, you need to be connected to the AT&T network to receive the OTA updates.
Not sure if the phone can be connected with KIES (and connected the phone to your computer), as I think AT&T removes this function from some Samsung devices. But that would be your best bet, if available.
The software updates are pushed out by IMEI on the AT&T Network. If your account is not set up with the correct IMEI it may delay the software push. Additionally for your device to receive the update you must be connected to the AT&T Network (The update will download via WiFi only, but needs to talk to AT&T servers via your active AT&T SIM card).
If you are in Israel, you will not be able to use the AT&T Software Update to update your device and AT&T will not be able to push the update for you. All AT&T devices are configured to work exclusively on the AT&T network. You may be able to get the update though Samsung and update via Samsung Kies on your computer. I would reach out to Samsung to see if they can assist you with this!
Hope this helps!
*I am an AT&T employee and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.