All we know is that the unspecified sensor outputs a 50mV peak/peak wave at an unspecified frequency,
and that the wave is superimposed onto an unspecified DC voltage.
If you design that preamp right, and you code/connect to the Arduino right, then you don't need rail2rail opamps.
There are two opamps in an LM358 package.
You can basically use one as buffer/low-pass filter, and the other one as gain stage.
The gain stage should be biased onto 1.65volt if you use Aref as I have explained.
Leo..