I changed my site’s domain a month ago so that my old site http://marc.abramowitz.info does a permanent (301) redirect to my new site: https://marc-abramowitz.com but the old site still has a PageRank of 6 (according to http://www.pagerank.net/pagerank-checker/) and the new one 0. I have a Google Sitemap and everything.
Do I just need to wait longer for everything to sort itself out? Or do I need do anything else to move the process along?
Google Page Rank updates publicly once every not-so-often. You’ll have to wait until Google actually updates the public page rank numbers to see a difference. That could be six months from now. You seem to have done everything correctly, so just wait. 🙂