Expiring APNS - Will push notifications still work?

I have an app that uses push notifications and I received an email that my APNS will expire in 30 days.

Will the push notifications still work after that certificate is expired? Or will they suddenly stop on that day?

My understanding was that they should continue to work but i won’t be able to make a new build unless I create a new APN certificate.

Can someone clarify this and tell me if I should create a new cert now and make a new build before the expiry date of the old one?