I'm pretty inexperienced at more complicated SolidWorks processes so I'm hoping to get some help/knowledge here.

In my part below, I'm trying to create a fill/boss that makes the entire top surface smooth and slope downward towards the back square edge where it will flow into a fillet. I was able to do a boundary surface and add a guide curve which pretty much shows what I'm going for, but I think this is the wrong way to go about it. I think I can do this with a boundary boss somehow? Can someone enlighten me?

Attached pictures are of the part as I have it now, and when I added the boundary surface and guide curve to better illustrate what I want.