Nice! 
Sorry, I did never dump actual SRAM-data from my carts.
However, using the same sources as I did, you should be able to implement it quite easily:
- Cartridge addressing scheme, i.e. which lines you have to set low / high to tell the cartridge that you want to read SRAM:
http://www.emulatronia.com/doctec/consolas/snes/sneskart.html#cartridgeaddressing - Code in Python for the Raspberry Pi by waterbury that includes SRAM-reading (just do a text-search for SRAM on this page):
SNES-Pi/cart_reader.py at master · waterbury/SNES-Pi · GitHub - Reading SRAM-size and decoding Romtype (lorom / hirom) from the cart-header is already implemented in my code...
HTH & best regards
Michael