Hi,
Looking at the notification, it seems to have uploaded the rows successfully for classification, so no issues there.
Usually it would take upto 72 hours for classification data to showup in reports and that would be the best way to validate the classification import data.
However, you can also try doing a browser export and check if you see 'uploaded' values in your browser export file, with that you would atleast have a confirmation that there wasn't any issue with upload of classification rows.
Thanks.