Hi ollie,
In WinForms SfDataGrid, to display the value in terms of a progress bar, we have a separate column named "GridProgressBarColumn". Please refer to the user guide documentation below for more information regarding the GridProgressBarColumn.
UG documentation: https://help.syncfusion.com/windowsforms/datagrid/columntypes#gridprogressbarcolumn
Regards,
Sreemon Premkumar M.