OP, my daughter started coming home on her own at 5th grade/age 10, but it was only for an hour.
This year she's in 6th grade and her older brother is in 9th grade. They come home alone around 4:45 to 5:15 once a week, and my husband and I don't get home until more like 7 that one day. So that's three hours more or less on their own but they do have each other. And, I'm not wild about it. But it is OK.
I think 3 hours alone, every day, is a bit much to expect at middle school. Yes, some kids do after school clubs, etc, or parents manage to stagger schedules so someone can be home a little earlier.
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