I would set the row filter property on your table (or the row hidden property) to the expression
=TimeSpan.Parse("23:59:59.990") = CDate(Fields!item.Value).TimeOfDay
That is easy to read, and shouldn't be too bad performance-wise.
An alternative could be =CDate(Fields!item.Value).ToString("hh:mm:ss.fff") = "23:59:59.990"
but converting to string to do the comparisons doesn't look proper.
If those solutions look like they'd work but you need more details I could give more detailed instructions.