amp redirection

I had used amp on a website. and then removed it after 2 months or so. I deleted the plugin. And didnt redirect the urls. Now when i am trying to redirect with this code in .htaccess –

// Redirect AMP to non-AMP
RewriteEngine On
RewriteCond %{REQUEST_URI} (.+)/amp(.*)$
RewriteRule ^ %1/ [R=301,L]

nothing happens – it remains on the same page. ie it is not redirecting to the non-amp version.

When i check the amp url on a website crawler it says –  the canonical tag is pointing to the non-amp version. Is there anything else i should do?