No, the monoclonal infusions like Regeneron have always been for early in the infection and weren’t given after admission to the hospital. Covid is two stages - the infection stage when antibodies are helpful, and the inflammation stage when antibodies are useless (because you don’t really have the active infection anymore) when the cytokine and other inflammatory causes are damaging organs.
The infection stage, up to seven days after symptoms develop, iirc, is when monoclonal treatments are given.
The inflammation stage is when steroids, etc, are given to tamp down the inflammatory response.
Ah, I was under impression it was for mid to late stage, in hopes of keeping them off breathing tubes. Thanks for the clarification