Hello Lola_Priya
No. The Saver Day Pass grants free travel to inhabited places only. It is destined for inexpensive travel between places, and not for mountain excursions.
Except for Mt. Rigi, Mt. Stanserhorn, Stoos, Klewenalp, and Mt. Rochers-de-Naye, the Saver Day Pass neither gives free travel nor discounts on mountain excursions. It also cannot be combined with other tourist offers to benefit from further discounts.
If you want a travel pass that grants discounts on mountain excursions, the Swiss Travel Pass is the ticket to go.
Or, you have the Swiss Half Fare Card in addition. But then, it is the (Swiss) Half Fare Card that grants the discount, not the Saver Day Pass. The Swiss Half Fare Card also works with the Berner Oberland Pass; their combination is actually recommended.
https://www.sbb.ch/en/tickets-offers/tickets/guests-abroad/swiss-travel-pass.html
https://www.sbb.ch/en/tickets-offers/tickets/guests-abroad/swiss-halffare-card.html
Kind regards,
Roland