ICANN publishes the TLD DNSSEC Report : http://stats.research.icann.org/dns/tld_report/

For ccTLDs only, there is this list : http://www.statdns.com/cctlds/

This is the right question. ICANN likes to put out these happy press releases, but they don't give us the details. It's necessary to name and shame the TLDs that are behind the curve.