A correspondent has drawn my attention to the existence of an English translation of Origen’s nine surviving homilies on the psalms. It is to be found in a dissertation by Michael Heintz, The pedagogy of the soul: Origen’s “Homilies on the Psalms“, Notre Dame, 2008. It can be accessed via the commercial ProQuest database – some may have subscriptions at their university – as UMI Number: 3309539.
Of course this does not include the recent discovery of a whole mass of Origen’s homilies. These are those on Ps.36-38 (37-39 in the other numbering). The prologue by Rufinus, the translator (into Latin), is also included.