Off the top of my head from personal experience: I feel like I have more energy throughout the day. it’s easier to concentrate. my mind feels sharper as in thoughts come easier. I don’t often have that “it’s on the tip of my tongue but I can’t completely recall it” sensation. I feel more emotionally consistent (if that makes sense?). My mood basically stays stable throughout the day a lot and I don’t fluctuate based on my feelings as much. I just feel more centered. I just feel cognitively sharper.
I also don’t consider myself having a particularly robust meditation practice. I meditate for about 15-25 minutes daily depending on time / my schedule.
I’d say that the biggest benefit is that you’d be well on your way to having established a lifelong habit of mindfulness practice which is probably the most effective thing you could do to have a happier life long term.