First time in Switzerland - Itinerary Review

I am not sure if you have fully research transit times. Have you? For example, you cannot explore Lauterbrunnen, Murren, and Wengen in one day in any meaningful fashion.

Yes I have no clue about the transit time. I just want to cover the most I can that day as I'll be leaving to Geneva late evening.

Better scope that part out! SBB is the Swiss train service for accurate times, but even a quick Google search would give you a better sense.
I prefer seeing one places well versus seeing multiple places in a blur, up to you!

This schedule is extremely packed - you're just trying to fit way too much into 9 nights and you're going to be exhausted spending most of the trip just running around trying to "see it all". Basically every day you have multiple big activities that aren't necessarily all close to each other and I think you haven't really thought through the logistics of how much running around you're going to be doing.

Thun is not the best base for the activities you've listed wanting to do in the Jungfrau Region. You're staying in Geneva, but visiting Chamonix two days in a row? It's fine to have a wish list, but my guess is you're going to be able to accomplish about half of this.

I'd also say that the itinerary you have is very busy, with little time to actually soak in the scenery, people, culture, and food of the places you plan on going.

I know that there seems to be a need to "fit it all in because you never know when/if you'll be back," but that can lead to frustration. Definitely look at travel times and plan some buffer for things possible going wrong (e.g. delays, cancellations). Plan time to soak in a town or two. Vacations/holidays should be relaxing, not even more stressful than the regular 9-5 grind.

Perhaps prioritize your destinations and sights. Use three tiers: "must-see now," "would like to see now," and "could save it for another trip." Have a sense of humor about it and be ready to improvise here and there. I know it's not in everybody's character to go off-the-cuff with international travel but it can lead to lovely surprises - and great stories to tell when you get home.

That said: enjoy the trip!