Per the timeline mentioned in the webcast the Crew Dragon separated from its trunk before the deorbit burn.
I suppose that happens so clean separation can be confirmed before committing to deorbit as reentry with the trunk still attached would be a problem (and it saves some fuel too).
But it means now there is a standalone Dragon trunk in LEO which might take some time to slow down to (uncontrollably) reentry.
What orbit was it left in? Did the Dragon lower the perigee meaningfully before the separation or is it left near the current ISS altitude?
And how long is it expected to stay there before being slowed down enough to burn in the atmosphere?