Was just setting up with Sam about a possible mission in Moldova.

[ Which will get interrupted when he gets a call from Bruce Banner, and he'll head over to Scotland. But he doesn't know all that. Not specifically. ]

I haven't met Thanos yet. But Sersi is from a future point in the timeline. She says we defeated him.

[ She also didn't say what or who'd they lost in the process, but Steve's main concern had been getting back so he could fight Thanos, and now that wasn't a pressing matter. ]