Looks like Tocilizumab doesn't help Covid-19 patients, although a lot of people are paying a lot of money for it. Some random blind clinical trials have failed to show any benefit. It does work against a cytokine storm caused by some other diseases, as an interleukin-6 monoclonal antibody. But apparently, not Covid-19. The manufacturer makes no claims for it against Covid-19. (TrialSiteNews)

There are other interleukins that contribute to cytokine storm, so specifically knocking out IL-6 may not make any difference. (my opinion)