It depends on what you mean by that. Many Palestinians would consider all of Israel to be occupied Palestine. What I think what you mean to ask is if they are firing on illegal settlements. No, those are in the West Bank. They are mainly firing at Ashdod, Ashkelon, Beersheeva and Tel Aviv which are all north and east of Gaza.

Could their rockets even reach those areas even if they tried, even if the Iron Dome wasn't stopping most of them from getting through? I'm not familiar with their capability/reach.

They are unguided munitions. They're an accelerated cannon ball and even then they don't seem to put much effort into aiming them at all.

It is a futile exercise to try to hit anything with these rockets. They will occasionally hit something by pure accident.

Rockets from Gaza already reached Jerusalem and the sorrounding area, so yeah they can.