Morning, from the pics on the window you can see your concerns about chipping and needs addressing and the internal corners do indeed get siliconed as it’s a movement joint. But some aren’t the neatest cuts.
The point raised about blobs under the tiles , not a fixing method that is condoned within the tiling industry and also needs to be highlighted.
I also notice on a couple pics that joints don’t line up on an external corner. Write down all your concerns and air these with your installer as I won’t use the term “Tiler” as it’s certainly not the work of a pro. Good luck and keep us informed how you progress.