How can I view the cpu minutes used by my site?
enable them here: https://panel.dreamhost.com/index.cgi?tree=status.stats&View them at: http://yourdomain.com/stats/resources/
domain.com/stats/resources/doesn't work for me
I believe the stats are only created once per day. Did you wait 24 hours after enabling CPU logging before trying to access stats/resources/ ?
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If you are big on stats you can install awstats for free. It's explained in their wiki.
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can you get awstats to track CPU usage as well?
No - it's purely web stats. You can learn more on sourceforge.net