Welcome to SR! You'll find a lot of support here. Just wanted to point out that going to meetings won't keep him sober. Finding a sponsor and working the steps will. While working the steps, he will be forced to look inside himself and work on other issues besides just drinking. I would say, if and when you see a marked improvement in his attitude, it could mean that he is actually in recovery and not just not drinking.
Also, just because he quits drinking doesn't mean that the marriage will be okay. Many times, when an alcoholic quits drinking and even when they are working a good recovery program, the dynamic of the relationship changes. A good rule of thumb we use around here is working a good recovery program and seeing progress for a year. That will give both of you time to see if there are positive results.