Is there a working CPAN/CPAN6 like project for Perl 6?

Markov owns cpan6.org and worked on-and-off for some years on it. Most people I've talked don't regard this project well for various reasons. Most existing Perl 6 code lives at modules.raku.org, formerly proto.perl.org.

There's been talk on cpan-workers to simply extend the archive structure in some canonical way to make it more suitable for other languages, a solution arrived 7 years later.

Your first stop for Perl 6 modules should be https://modules.raku.org/.

Modules should be installed with zef.

The new hotness is zef. This will query modules available on the Perl 6 website. It comes with the latest version of Rakudo * and is very simple to use.