Korean Air Skypass - Seat Assignments for Korean Air through Expedia

I booked a DFW-ICN flight through Expedia the other day. It let me select my seats, but one of the other threads makes me think that they may not be "for sure". Looking back, I probably should've booked straight through Korean Air, but what's done is done. Has anyone had experience with booking Korean Air through expedia wrt seat assignments? I want to make sure I keep my window seats.

I would call Korean air to confirm your seats. Are you within 90 days of your flight?

Yes- I fly out Oct 29th. I'll call Korean Air. Thanks!