Ist diese Tagestour machbar?

Hello. We will be in Oslo for a few days at the end of August. I was looking around at day trips and fjordtours has a day trip

1. Train from Oslo to Myrdal
2. Flam railway
3. Nærøyfjord Cruise
4. Bus to Voss
5. Voss to Bergen.

This seems a bit ambitious. Especially the time given to make connections. Does anyone have thoughts on this ?

Also, We were thinking of doing a sleeper train from Bergen to Oslo. We’ve taken sleeper trains before in India, Vietnam, and Egypt, are they delayed often? We have to catch a flight out the next day in the afternoon.

Edit: If things go wrong at any point, can I just catch the Bergen -> Oslo night train back?