When he sent your completion paperwork to you he will ( should) have sent a copy to the Insolvency Service and they will remove your entry on the Insolvency Register within three months of getting that (usually three months to the day, although they quote "up to" ).
You can check your entry and drill down through your name for details ... it should show "completed", rather than "active", which will confirm that they have been notified. This is assuming that you are actually on the Register --- When I did my IVA it took me 6 months to actually appear there ! Of course, with covid related delays, having been only a month since the certificate was issued, things might be delayed a little.
Be aware, though, that the IVA will remain on your credit reference agency files for 6 years from the start date.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014