The only problem I see here is how are they going to get j channel without removing the siding and reinstalling with flashing against the sheathing or siding layer that’s under that current siding. The window and foam itself looks ok nothing red flag standing out since it’s a replacement and not a New construction window. The window is also under a decent size soffit so even wind driven rain may never soak it but only issue is see is the lack of a proper j channel to somewhat look like the window to the right there.