Simply, I don't know. What you SHOULD look forward to is some kind of noticeable improvements if for no other reason than suddenly his body is being perfused with more oxygen and nutrient-rich blood. I expect, but again don't know, that his heart may be in hear failure due to the deterioration, and maybe his comorbidities are largely due to, or have been exacerbated by, his poor heart function. If the stents, and the team inserting them, find the magic, you may get a large chunk of your hubby back.
This will take time. He's already pretty beaten up, and now this. I would expect him to lean on you heavily for as much as two weeks, but maybe a lot less if the stents do their magic. Maybe a month....depends on how he rolls with it. I'm dealing with a sick wife, very-aged dad, and his partner who has been in hospital a week needing a pacemaker rather urgently. I'm run almost ragged. I'm no hero, but I learned in the military to put my head down, squint a bit, and just put my shoulder to the grind. It ends ere long.