How can I find out which tag wikis I can edit without clicking through to see if there is an
edit tag wiki link offered?
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One way is to look at your badges page and see if you have a bronze tag badge. (which is a good enough approximation of "score of 100 or more").
As for tags where you are among the Top 20 answerers, I have no idea (other than looking at a tag's topusers)