I bought many packs of SX-70 Time Zero film around 2005 and am now down to the last few. In my experience the PolaPulse battery does retain enough power to operate the camera and eject the film. However, my packs have been kept refrigerated, which slows down the chemical reaction and preserves battery life (*).
As for the image, that's not as good a story. The colors were washed out and the images had a bronzed appearance. Often the chemicals won't spread properly and you'll get areas of poor development. Oddly though, last summer two of these packs produced perfect color and images.
From the 1990's? Hard to say what you'll get. No harm in trying, as the film has been paid for already.
(*) old car batteries die more often in very hot weather than in cold.