In canon 8.19 in D flat Major, the chord progression is a little odd, going I-IV6/4-V-IV6-I6/4-vii0-IV-V-I6
Still, the canon parts do line up to make the chord progression sensible.


In canon 5.16 in D minor, a much simpler example, the chord progression seems to go i-vii-i
The four voices line up to make these harmonies when sang at the correct times.