Why would they report a high profile visit to a military manufacturing facility on the same day he was there, that's pretty poor security even if he'd already left.*
Ukraine haven't yet confirmed if that particular factory was hit in the Russian strikes. An embarrassing silence on that point.
As to the flight back, do not forget to factor in the time difference for Ukraine vs Washington - so it would depend at what time LG left Ukraine, usually (during this war) travelling to Poland by train to then fly back to Washington
*Anon thinks the Meeting with Zelenskyy and the factory visit both took place on Friday. The drone factory visit was published Saturday - it doesn't explicitly state he was there on Saturday.