No, it is not a good time. A project like Ubuntu should now be in freeze as they had about 3 months before release

This bug was reported (and resolved by rolling back to the GNU coreutils version of cp) on June 30, a little over 15 weeks prior to the scheduled release date.

Which distros have a feature freeze that far in advance?

Ubuntu hasn't even scheduled theirs for this release yet; if you edit that url to look at previous releases' schedules you can see their feature freeze and debian import freezes are typically about 2 months prior to release. (See here for descriptions of all of the different types of freezes...)