How to get a list of all canonicals that are set?

I want to update my htaccess file to force a trailing slash on directory type URLs, etc. But first I wanted to get a full list of canonicals that are set on all my posts and pages. I saw in the knowledge base that I can filter the posts list, but I don’t see canonicals as an option in the all_posts dropdown. What I ultimately want is a plain text listing of all the canonical URLs and hopefully the URLs of the posts they appear in. I just want to confirm none of them are missing a trailing slash, because I suspect that web crawlers might flag it, if I tell them that the definitive URL is a post that is inaccessible on my website (after I update my .htaccess to force a trailing slash).