How to show only the last employee that updated the record

I want to show only the last "EMPLOYEE" updated in the record. In other words, the current employee assigned to a unit. Any help will be appreciated.

SELECT     TOP (100) PERCENT dbo.WOMAST01B.step, dbo.WOMAST01B.wono AS WO, dbo.WOMAST01B.item AS PN, dbo.WOMAST01B.location, 
                      dbo.WOMAST01B.dept AS SHOP, dbo.WOLABO01B.prempl AS EMPLOYEE, SUM(dbo.WOLABO01B.time) AS TIME, DATEDIFF(dd, 
                      dbo.WOMAST01B.recdate, GETDATE()) AS [DAYS LEFT], dbo.WOMAST01B.tat
FROM         dbo.WOMAST01B LEFT OUTER JOIN
                      dbo.WOLABO01B ON dbo.WOMAST01B.wono = dbo.WOLABO01B.wono
WHERE     (dbo.WOMAST01B.dept = 'AVI')
GROUP BY dbo.WOMAST01B.step, dbo.WOMAST01B.wono, dbo.WOMAST01B.item, dbo.WOMAST01B.location, dbo.WOMAST01B.dept, 
                      dbo.WOMAST01B.location2, dbo.WOLABO01B.prempl, DATEDIFF(dd, dbo.WOMAST01B.recdate, GETDATE()), dbo.WOMAST01B.tat
ORDER BY [DAYS LEFT] DESC

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Book1.xlsx