Questions regarding E+ seats and upgrades on UA flights:

I am scheduled to fly on a CO codeshare (UA metal) to IAD tomorrow.
When I first booked the flight, I called United reservations to get E+ seats.
When checking the reservation on ual.com, it showed "Flight: Confirmed. Upgrade Pending" and my E+ seat assignment was shown.
When I checked the reservation status tonight (30 hours before the flight), it shows "flight confirmed", but the "Upgrade pending" text is no longer shown. The E+ seat assignment is still in there.
What does that mean? Have all upgrades been process and I lost out? Are upgrades in progress? Should I call UA to get put back on the upgrade list?

(As GE, I don't expect any upgrades on a UA hub-to-hub flight, but I at least want to make sure I maximize whatever chance I may have)