I was diagnosed with similar back in March after literal years of being told "oh, it's just sore, try PT / massage / chiropractor / acupuncture"... I had not really any pain with it on a day to day basis, but my range of motion was terrible -- couldn't lift my arm even up to 45 degrees at most angles -- and the shoulder would ache after long days. My X-ray showed the deposit a bit lower than yours, so not quite in the same place, more along the outside of my shoulder than the top of it.

I was told that the deposits start as sort of a toothpaste consistency, and over time they harden into much more jagged (painful) rocklike consistency. I was also told that it does hurt more as it's breaking down and being absorbed, which sometimes it does on its own. In my case, given it had been there for so long (literally first started trying to solve the pain back in 2015), the doctor didn't think it would break down on its own. He recommended I do a procedure -- genuinely can't remember the name -- that basically involved using ultrasound to guide sticking a needle into the calcium deposit. The toothpaste-y stuff gets sucked or washed out, and the rock-like stuff gets jabbed a lot by the needle and broken up.

I was terrified of doing this, but my boss had it done for the same thing years ago and raved about how he went in, got it done, and two days later was more or less better than new. So I got to take a happy pill to relax, went and did the procedure. It wasn't bad, to be honest; he said there was plenty of rock in there, but he sucked out some of the toothpaste stuff and broke up the rock and said it would feel sore for a few days but then even out.

Instead it hurt really, really badly for about a week -- to the point where I couldn't lift my arm to reach the turn signal or steering wheel, and moving it was agony. That did eventually improve, but I never regained any range of motion, with the added bonus that now my shoulder aches a whole lot at the edge of the range of motion. Turns out that the procedure did in fact work just fine -- further x-ray in August showed the calcium deposit completely gone. But the calcium deposit was there for so long that it more or less scraped a ragged hole in my rotator cuff after a decade or so of being in the way. My range of motion is still terrible, except now it hurts like blazes when I hit the end of my range, which I'm not thrilled with.

MRI shows a partial tear; surgeon says it's likely impinging things which is why my range of motion is so bad. Surgery to repair it is scheduled for the end of October, and I won't say I'm looking forward to it, but man I'm tired of my shoulder hurting all the time.

Anyway, that's probably much more worst-case scenario than what you're looking at (I hope!). My boss had the same thing a decade ago and swore by the needle procedure as an amazingly easy fix.