sp_BlitzWho saving to a table How to save result of sp_BlitzWho to a table? An option to save to table is not there compared to other procs like sp_Blitz.
You can declare table variable with fields fully equal to SP output and save results to it. E.g.:

    DECLARE @who_results TABLE
    ([run_date] DATETIME,
     ...
    )
    INSERT INTO @who_results EXEC sp_blitzwho


After that, you can do everything you want with data in table variable.