Is my Macbook powerful enough to run Premier Pro with no stutter-jitters when editing?

Since you are not editing 4K, it's possible to edit relatively smoothly, but it can never be guaranteed, because whether it previews smoothly depends on what is in the timeline (formats, resolutions) and how complex it is. The best chance you have is if you are mostly editing one or two tracks with cuts only and maybe some titles, but with few (or better yet, no) transitions or effects, with all media on fast storage, using editing formats that don't require a lot of decoding/decompression (since that taxes the CPU). When you add transitions, effects, and tracks, the load on the CPU goes up a lot unless you used effects that can be accelerated by your graphics hardware.

Upgrading your current Mac is not an option. There are no CPU or internal graphics upgrades available for any Mac laptop, and 16GB is already the maximum amount of RAM for your model.

If you want to edit smoothly, keep your productions simple. Using as few tracks as possible, and as few effects and transitions as possible. If you need  a lot of those in your production, you will need a more recent or more powerful computer.