Sum of results in a MySQL procedure

I have the following procedure in a DB in MySQL:

  BEGIN
     SELECT(vista_detalle.numero,vista_detalle.id_empleado, vista_detalle.nombre,      
    COUNT(
        CASE
            WHEN vista_detalle.tipo = 'S' AND  vista_detalle.estatus = 'F'
             THEN 1
            ELSE NULL
             END
          ) AS 'entrega'

        FROM db_becas.vista_detalle

WHERE DATE(vista_detalle.fecha_modificacion) BETWEEN fecha_inicial AND fecha_final
GROUP BY vista_detalle.id_empleado
ORDER BY vista_detalle.nombre
END

And it shows the following output:

numero  id_empleado nombre                 entrega
333408  75  AARON RICARDO SOLIS PINEDA          10
314731  65  ALICIA LIZETH DOMINGUEZ ARELLANES   10
314405  45  ALMA RENATA FRAGOSO ARGUELLES       13
289411  80  ANA KAREN DE LA ROSA SAENZ           8
314645  63  ANA KARINA GARDEA RIVAS             10
314351  33  ANA LAURA MUÑOZ OJINAGA             11
327847  103 ANGEL ALBERTO RAMOS ROMAN            9
314699  37  ARMINE ARISVE AYALA RODRIGUEZ        6
496119  30  ARTURO GALLEGOS SALAS                2
335578  104 ARTURO GALLEGOS SALAS               10
314373  77  ATZIN DE JESUS SALDAÑO LUJAN         8
304411  115 BRENDA CRISTINA TERRAZAS ENRIQUEZ    2
304473  61  BRENDA JUDITH MONTES HOLGUIN        10
333481  34  BRIAN ABEL FLORES CALAHORRA         10
333433  69  BRYAN OBED OROZCO GUTIERREZ         10
305334  43  CARLOS CARRERA DELGADO              11
308841  35  CARLOS ULISES MONTES SALMERON        6
320702  93  CELESTINA MANCINAS LAREA             9

How could you add the results obtained in the 'delivery' column?