Glad he's getting help! Hope he does well. There was a sad story here though. A little town up the road had one homeless guy for several years. Lived under a bridge, refused any real help, many tried, churches, individuals. It took years to get him into a group home setting for mentally challenged. He was normal but it was the only bed for him in a small town.
After he started getting state funds he got a bicycle, one of those that you lay on your back to ride, sits low to the ground. Had a small red reflector behind and white light on the front. At dusky dark he’d ride across town to the kfc for chicken, saw him there once. He’d ride up the only 4-lane and in the right lane, legal but still difficult to see. I saw him almost get hit by vehicles more than once, almost every time I saw him.
He did finally get hit by a car, think I posted about it. The town got him a warm bed, food, pocket money and the poor guy was dead in 2 years.
I hope your guy gets long term help. Folks who fail to provide their own bed and board usually need long term, hate to use the term supervision, but close enough. They didn't get that way over night. Get that far off track and it takes time to get back.