Can I make this query into a single one? Maybe like a If Else statement? In a Stored Procedure I could do it, but i'm not sure how with 'Selects and updates'...?

Code:
Update WhseOpenOrders 
Set LateIndicator = 'L'
FROM WhseOpenOrders 
WHERE PromiseDate < CONVERT( varchar(20), getdate(), 101) 

Update WhseOpenOrders 
Set LateIndicator = '*'
FROM WhseOpenOrders 
WHERE PromiseDate BETWEEN CONVERT( varchar(20), getdate(), 101) AND CONVERT( varchar(20), getdate() + 14, 101)