When there’s a general curfew, it applies to everybody other than those who have legitimate purposes (such as work shifts) to be out after curfew. I don’t know of any sort of curfew just for homeless people, if that’s what you mean.
In my city, the chief of police said that the curfew rules under coronavirus restriction basically give them a tool they could use if they wanted to stop somebody who’s out after hours, but they could look the other way if they wanted to. They could stop people and hassle them a little, and if they wanted to take them in they could.
But they have in general been lightening up on detaining people because they don’t want to either risk bringing more covid cases into the jails (which are hothouses for contagion) or put new inmates at risk of exposure if they weren’t already. They have enough to do without hammering on people who are on the street too late.
I have heard, though, that they will do a long, slow survey by cop car headlights or flashlights if they see people out together maybe where they shouldn’t be gathering, or looking like they might not have a legitimate purpose for being there. That kind of notice is like a silent warning that might not end there the next time.
Right now the city police mostly seem to be leaving the homeless folks and campers alone, aside from periodic sweeps, even though the visible numbers have grown dramatically in recent months, for reasons I guess we know. The city officials are trying to find solutions and offer help rather than punishing people who are already struggling.