See the image here of the current tub.
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The correct way to do this is to set the tub prior to drywall. Then the cement board goes on and stops at the top of the tub flange. The tile would then go on the cement board and span over the flange and seal to the tub top surface (usually grout and caulking).
The tub flange protects any water that may get behind the tile from going back behind the tub.
As you have the drywall already installed, it looks like you can apply the cement board on top of that and stop it at the top of the tub flange then proceed as stated above. You will have to come up with a way to finish the long vertical edges where the tile/ cement board ends. It will look like an old "mud set" tile job.
It appears that your back right corner of the tub may be too far away from the drywall to allow the finish side of the concrete board to protrude beyond the flange. I think you are going to have to fur that wall out behind the cement board in the corner for the tile to work properly.
