On March 30, 2022 the results from the early treatment clinical trial were published in the New England Journal of Medicine (NEJM):
On March 29, 2022, a guide for implementing a plasma transfusion center for outpatients with COVID-19, including logistical, staffing and blood banking requirements was published in the journal Transfusion.
On December 21, 2021 the pre-print was published:
The trial stopped enrollment on October 1.
You should also contact your physician to see if you qualify for monoclonals which are an antibody alternative.