I do not know what time will bring but right now, the back is getting better; not quite pain free but much, much better.
I did PT, decided to see what I could do on my old West Peoria 5K course. The Garmin went haywire at about 1.5 miles and mismeasured the distances; recorded it as 3.7 miles.

Nope…that would be an outstanding RUN for me right now.
The Google maps app is probably too generous; I called it 3.1.
Then came pull ups, (10, then 10 sets of 5, last two mixed, and there was quick rest between each set), push ups (3 sets of 30 incline, 10 regular)
Stretch, (pull ups: felt it a bit)
bench: some worries here; two bumpers plus the step stools (rated at 700 lb) did the trick: 155: 6, 5, 5, 5
curls: 3 sets of 10
Swiss bar high incline: 3 sets of 10 x 94
Overall: much better. NOT well, but that “hollow” feeling in my thighs is gone.
Shoulder: much better.
Weird: if you told me that when I was first feeling this (back in the summer of 2020) that it would take THIS long to show improvement, I would have been deeply depressed. If you told me last summer that it would take this long..still depressed.
But if you told me in April that I’d be feeling like this now, I would have been delighted. Perspective matters.