If there isn't a suitable plugin you could use something like:
# cd $DOKU_DATA # Or wherever your data root is.
# find meta -name \*.changes -execdir tail -1 {} \;
to get all the latest revisions. You'll want to process the output, the fields are:
1) Time of last change in seconds (use
date(1)[/m] with option [m]-t to change it to a formatted date/time)
2) On my wiki the string "::1" which I'm not sure of.
3) Operation: C=created, E=edited etc.
4) Page name
5) User
6) Edit summary
7) bytes changed.