I managed to get quite a usable list by sniffing out the versions within the SProcs' source code, as stored within the `sys.comments` tables.

[![screenshot of T-SQL results][1]][1]

A healthy amount of assumptions was made, so **test this code on a solitary test instance first**, before going wild on your multitude of Production servers...

**Edit**: added Adam Machanic's [sp_WhoIsActive](http://WhoIsActive.com) as an example of how to add to this scanner script.

    USE [master];
    
    IF OBJECT_ID('tempdb..##DBA_SProcs') IS NOT NULL
        DROP TABLE ##DBA_SProcs;
    
    CREATE TABLE ##DBA_SProcs (
         DBName             NVARCHAR(100) NULL
        ,SProcName          NVARCHAR (50) NULL
        ,VersionString      NVARCHAR (50) NULL
        ,VersionDateString  NVARCHAR (50) NULL
        );
    
    EXEC sys.sp_MSforeachdb
         @replacechar = N'¬'
        ,@command1 = N'
    USE[¬];
    
    INSERT INTO ##DBA_SProcs
    SELECT
         DB_NAME() AS DBName
        ,LTRIM(RTRIM(
            REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(
                SUBSTRING([text], CHARINDEX(''sp_Blitz'', [text], 1), 18)
                ,'']'','''')
                ,''('','''')
                ,CHAR(9)/*Tab*/,'' '')
                ,CHAR(10)/*LF*/,'' '')
                ,CHAR(13)/*CR*/,'' '')
                ,''@He'','''')
                ,''@Ch'','''')
            )) AS SProcName
        ,REPLACE(REPLACE(
            SUBSTRING([text], CHARINDEX(''T @Version'', [text], 1) + 3, 15)
            ,'', @'' , '''')
            ,''Version = '' , '''')
            AS VersionString
        ,REPLACE(REPLACE(
            CASE
            WHEN CHARINDEX('', @VersionD'', [text], 1) > 0
            THEN SUBSTRING([text], CHARINDEX('', @VersionD'', [text], 1) + 3, 24)
            ELSE SUBSTRING([text], CHARINDEX(''T @VersionD'', [text], 1) + 3, 24)
            END
            ,''VersionDate = '' , '''')
            ,'''''''' , '''')
            AS VersionDateString
    FROM sys.syscomments sc
    WHERE sc.colid <= 1
      AND sc.[text] LIKE ''%sp_Blitz%''
      AND sc.[text] LIKE ''%T @Version%'';
    
    INSERT INTO ##DBA_SProcs
    SELECT
         DB_NAME() AS DBName
        ,''sp_WhoIsActive'' AS SProcName
        ,SUBSTRING([text], CHARINDEX(''Who Is Active? v'', [text], 1) + 15,  7) AS VersionString
        ,REPLACE(
            SUBSTRING([text], CHARINDEX(''Who Is Active? v'', [text], 1) + 23, 10)
            ,''-'' , '''')
            AS VersionDateString
    FROM sys.syscomments sc
    WHERE sc.[text] LIKE ''%sp_WhoIsActive%''
      AND sc.[text] LIKE ''%Who Is Active? v%'';
    ';
    
    SELECT *
    FROM ##DBA_SProcs
    ORDER BY DBName, SProcName;
    
    IF OBJECT_ID('tempdb..##DBA_SProcs') IS NOT NULL
        DROP TABLE ##DBA_SProcs;

  [1]: https://i.sstatic.net/euPyO.png