Speaking from experience here. They have enough time. Most of them are completely politically uninvolved, but the ones who do know about politics are very frequently conservative, so i’m not entirely sure how to go about this.
It would make a lot of sense for rightwingers to mobilize the homeless and it probably won’t be as difficult considering homeless people get a huge amount of aid from churches.
What about trying to promote some anti work shit on /r/homeless plus trying to create groups of like minded people who are in the same situation? It may be a better way to try to start something than in person.