WordNet (r) 3.0 (2006):

in due course
    adv 1: at the appropriate time; "we'll get to this question in
           due course" [syn: in due course, in due season, in
           good time, in due time, when the time comes]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "in due course":
   after a while, anon, auspiciously, before long, betimes, by and by,
   directly, ere long, eventually, in a moment, in a while,
   in due season, in due time, in good time, in proper time, in time,
   just in time, now or never, opportunely, presently, propitiously,
   seasonably, shortly, soon, ultimately