It seems it is beneficial in for those who suffer from an exaggerated IL-6 response to the virus.
A proper clinical trial is ongoing
http://www.chictr.org.cn/showproj.aspx?proj=49409
"fun" tidbit - from the end of the 50ies to the end of the 70ies, interferon was the holy grail of anti-viral research - you would get headlines about the flu/common cold/any viral infection being cured when interferon would be widely available. Then, in the 80ies, when it became widely available, it appeared that yes, it was part of the necessary immune response, it was also what was causing a lot of the disagreeable symptoms. A simple plan suddenly became more complicated. Then a bunch of other cytokines showed up and the whole thing became very, very complex. Most of those molecules play ambiguous roles, favorable at some level for some, annoying at other levels for others.
less fun tidbit - those drugs (talking about the class in general) are amongst the most expensive commonly prescribed drugs
https://www.ncbi.nlm.nih.gov/books/NBK349513/table/T43/
The Italian Drug Agency (AIFA) authorized the clinical trial a couple of days ago, I have read that as of today there are 50 patients enrolled. Roche is supplying the drug for free.