SQL injection and resulting query of sp_executesql

I've developed a stored procedure that utilizes dynamic SQL to search for specific entities (this is a procedure for catch all logic). Is this procedure prone to SQL injection, and how do I get the final query that is being executed sp_executesql i.e after the values are substituted?

Here when I use print @sql - it just gives me the query with parameter names but not the actual values. Thanks for your time!

CREATE OR ALTER PROCEDURE [dbo].[usp_SearchEntities]
    (@customerId      UNIQUEIDENTIFIER = NULL,
     @startRowIndex   BIGINT = 0,
     @pageSize        BIGINT = 20,
     @orderByColumn   NVARCHAR(100) = NULL,
     @orderDirection  NVARCHAR(10) = 'DESC',
     @statusCode      TINYINT = NULL,
     @regionId        UNIQUEIDENTIFIER = NULL,
     @entityName      NVARCHAR(254) = NULL,
     @identifier      NVARCHAR(25) = NULL,
     @outResultStatus NVARCHAR(100) = NULL OUTPUT)
AS 
BEGIN
    /* Turn off row counts */
    SET NOCOUNT ON;

    DECLARE @sql NVARCHAR(MAX);

    SET @sql = '
    SELECT e.Id, ev.EntityName
    FROM dbo.CustomEntities e 
    INNER JOIN dbo.CustomEntityVersions ev 
        ON e.ActiveEntityVersionId = ev.Id
    INNER JOIN dbo.CustomLocations l 
        ON e.LocationId = l.Id
    INNER JOIN dbo.CustomRegions r 
        ON l.RegionId = r.Id
    WHERE e.CustomerId = @customerId 
        AND e.IsDisabled = 0';

    -- Conditionally append WHERE clauses based on parameters
    IF @entityName IS NOT NULL
        SET @sql = @sql + N' AND ev.EntityName LIKE ''%'' + @entityName + ''%''';

    IF @regionId IS NOT NULL
        SET @sql = @sql + N' AND l.RegionId = @regionId';

    IF @statusCode IS NOT NULL
        SET @sql = @sql + N' AND ev.StatusCode = @statusCode';

    IF @identifier IS NOT NULL
        SET @sql = @sql + ' AND ev.Identifier LIKE ''%'' + @identifier + ''%''';

    -- Construct ORDER BY clause based on specific mappings
    IF      @orderByColumn = 'LASTUPDATED'       SET @sql = @sql + ' ORDER BY ev.LastUpdatedDate ' + CASE WHEN @orderDirection = 'ASC' THEN 'ASC' ELSE 'DESC' END
    ELSE IF @orderByColumn = 'REGIONID'          SET @sql = @sql + ' ORDER BY r.RegionName ' + CASE WHEN @orderDirection = 'ASC' THEN 'ASC' ELSE 'DESC' END      
    ELSE IF @orderByColumn = 'LOCATIONID'        SET @sql = @sql + ' ORDER BY l.LocationCode ' + CASE WHEN @orderDirection = 'ASC' THEN 'ASC' ELSE 'DESC' END
    ELSE IF @orderByColumn = 'STATUSCODE'        SET @sql = @sql + ' ORDER BY ev.StatusCode ' + CASE WHEN @orderDirection = 'ASC' THEN 'ASC' ELSE 'DESC' END   
    ELSE IF @orderByColumn = 'IDENTIFIER'        SET @sql = @sql + ' ORDER BY ev.Identifier ' + CASE WHEN @orderDirection = 'ASC' THEN 'ASC' ELSE 'DESC' END   
    ELSE IF @orderByColumn = 'RELEASEDATE'       SET @sql = @sql + ' ORDER BY ev.ReleaseDate ' + CASE WHEN @orderDirection = 'ASC' THEN 'ASC' ELSE 'DESC' END
    ELSE IF @orderByColumn = 'ENTITYNAME'        SET @sql = @sql + ' ORDER BY ev.EntityName '       
    ELSE SET @sql = @sql + ' ORDER BY ev.LastUpdatedDate ' + CASE WHEN @orderDirection = 'ASC' THEN 'ASC' ELSE 'DESC' END

    -- Append ORDER BY, OFFSET, and FETCH
    SET @sql = @sql + ' OFFSET @startRowIndex ROWS FETCH NEXT @pageSize ROWS ONLY';

    -- Execute the SQL
    EXEC sp_executesql 
        @sql, 
        N'@customerId UNIQUEIDENTIFIER, @regionId UNIQUEIDENTIFIER, @statusCode TINYINT, @entityName NVARCHAR(254), @identifier NVARCHAR(25), @startRowIndex INT, @pageSize INT, @orderDirection NVARCHAR(10)',
        @customerId       = @customerId,
        @regionId         = @regionId,
        @statusCode       = @statusCode,
        @entityName       = @entityName,
        @identifier       = @identifier,
        @startRowIndex    = @startRowIndex,
        @pageSize         = @pageSize,
        @orderDirection   = @orderDirection;

    -- Print the generated SQL for debugging
    PRINT @sql;

    RETURN 0;
END