When do big robots come?

I have played game a few times and I have got a handgun a hunting rifle and the shotgun from ibolmehn church. I am at the church now and so far I have killed runners and ticks shooting from the top of the church. my next mission is to go to stenhaga farm. does anyone know what is there eg just runners or a hunter? also when will I come across other robots that aren’t runners and ticks?
Thanks
oh and where is the best way to travel
roads coast etc?

you find a harvester at the next church at saltholmen, you only find tanks on the main land

You may find a Harvester spawn next to Saltholmen Church, but there’s no guarantee. Prototype Machines (orange colour) patrol the first island, and the larger ones may also spawn here.

As soon as you leave for the main island though, you’re going to bump into heavier resistance.

Roads are always a safe bet to keep your bearings. You’ll be less visible off the beaten path, but so are the Machines. Hunters can detect you from afar with infra-red scopes, for example.

You may also find a tank near the second church also if you don’t normally the first fight with a tank is when you just enter the farmlands