Your ergonomic task chair and having it properly/ergonomically set up is much more important than a sit to stand desk.
Standing doesn't improve your cardiovascular health. However, getting up from your chair every 30 minutes to an hour and doing squats, a short walk, and or stretching is much more beneficial.
My wife is a master's prepared nurse, deep into safe patient handling for Hospitals and Clinics. She's well-versed in human factors engineering, and oversees many workmen's comp cases involving injuries on the job.
Her work is how I discovered the Roller Mouse which I posted above (I can't work on a computer without one). Also, your vertical Mouse is also quite good for relieving wrist pain as you mentioned. A footrest under your desk at the right angle is also extremely beneficial.
Do a deep dive study on the sit to stand desk before pulling the trigger on one. While it has some benefits, it's not the be all end all.