I dont think this is possible in a grid view. Unless you want to use a template grid, I would suggest adding a checkmark or some other indication for the status. Take a look at the Excel import module, it has a nice looking table.
Content based Table Row Styling: The CSS class of a row in a table is changed based on the value of a columns. Booleans, enumerations and string can be used. When a column is made width of 0 it can be used for the styling but will not shown.