Hi sherry
No, the Saver Day Pass is only valid as far as Wengen or Grindelwald. It grants free travel on to these three mountains, all in Central Switzerland: Mt. Rigi, Mt. Stanserhorn, and Stoos.
The Swiss Travel Pass (not Swiss Pass) is granting a discount for Jungfraujoch. Alternatively, check the Top of Europe Pass.
Jungfraujoch is the most expensive Swiss mountain top. Do not buy tickets in advance as the weather is not predictable; on a bad weather day there is no reason to go there.
Best regards,
Roland