A lot of schools are going to this model now, at least in Texas around me. Texas requires interventions if kids fail the STAAR (the statewide test they take that shows they know the material they've learned during the school year) so a lot of schools have built in an intervention period (or whatever the campus calls it) to give those kids the intervention time. My kid doesn't need intervention so they just do their homework during that time. They can sign up to go to certain teachers to get help, too. And a lot of schools/teachers have gotten away from assigning homework, since it just punishes the kids who don't have support st home.
And the teachers aren't supposed to.