Thanks for using just answer.
Replacing the timing chains and related parts starts at around $2500.
With inclusive labor @ aroud 100 an hour sounds about right.
One of the things that the have to checked once torn down is the camshaft end play in the heads.
If that is out of spec then you also have to buy new cylinder heads...at that point it is cheaper to find another engine.
Dealerships are one of thoes funny things. you cant expect them to clean your car properly or even do a correct inspection but for internal workings of the engine normally they are quiet good.
This is due to the quality the workshops using genuine parts also most dealership's have a laptop next to them and follow a details
process of removal and reinstation.
In a smaller workshop they grab a manual and go from there so its more up to the quality of the mechanic rather then following a detailed steps.
I hope this assists you with you train of though if you need any other info about this please feel free to ask.