I would add a note of caution: Is your bass playing really calling out for extensive piano skills? Is your time management such that you can do your bass practice as well as working on a whole new instrument? I feel like it is often a distraction that bassists feel might be easier or some kind of work around - it isn't. Knowing more about harmony is never a bad thing, but, I think it takes years and years to get down arco melodies of tunes, arco arpeggios, and beautiful, in tune, in time, swinging walking lines of roots, fives, leading tones and chromatics.
The more you learn about harmony the more you will understand how nice a root only line is great!
So, my recommendation for a jazz bassist book remains Simandl book 1.
If you are full time student or musician, or retired it might make sense.
If it is really calling to you like a second instrument or a serious hobby, I think that is great. A some kind of "silver bullet" for jazz playing I would recommend heavier bass practice, instead.