Yes, your assumption is correct. Supersaver tickets are also available at full fare.
Kindly note, when you plan to use public transport during your stay, or even to do some mountain excursions, it is advisable to consider the Swiss Half Fare Card. It can save you a lot of money, especially if you travel with children, as it offers, in addition, the Swiss Family Card for free.
Swiss Half Fare Card – Switzerland at half the price | SBB