https://www.delta.com/content/dam/de..._schedules.pdf
I see one for SEA that shows a widebody - that was on Oct 18th. The rest look like 757s - perhaps a couple of those would have D1, but they all look like 753's, and I don't think those have been converted to D1.
You can also look in matrix. Under advanced controls use:
"dl" in the first box, and "aircraft t:767 t:777 t:339" etc in the second box. Obviously you won't see D1 configured 757's on there, but you'll at least see the widebodies.