Which TLDs are now having Delegation Signer (DS) signed by root

A question can be asked do you know if which TLDs are DNSSEC-enabled and have been signed by root.  I have a solution using "ldns-walk . | grep DS".  As shown in the screen dump below, they are : .bg, .biz, .br, .cat, .cz, ..dk, edu. .lk, .museum, .na, .org, .tm, .uk. and .us.  Hey, the US Government mandated the use of DNSSEC for .gov, what happens to .gov ?