Next you should fit the tiles on the wall inside the corner trim.
How to tile a shower wall with a window.
This video shares tips for how to tile a shower wall using subway tile.
You can expect to spend about four to five hours tiling a standard 36x40 inch double hung window.
Mark the tile where it overlaps the full sized tile and number it on the back side.
Use bullnose tiles to round off the edges of the window frame and tile the wall first.
Line up a tile with the edge of the window and protruding out over the full sized tiles on the wall.
Make sure that you locate the window outside the range of the spray from the showerhead.
Install tiles around the window by spreading an even coat of thinset with a comb trowel.
Afterwards install the bathroom tiles and place spacers between them as shown in the image.
That way you can make sure the grout lines of the recess are on the same plane as the wall.
Secure the tile edging into thinset and use a large level to make sure it is plumb.
The curbless shower had a window so we have tips for how to handle that and for ensu.
Caulk the joint between the jamb and the cementboard with a good quality silicone caulk.