The Dnipro is still a large river to cross and it's not going away. I looked at it in Google Maps and it's at least 500 m wide before and after the reservoir.
I am actually not sure how wide it will end up. Dnipro is actually reservoirs all the way up to Kyiv. It will be Ukrainians in Dniper HES that will control the flow from now on.
Btw, Google added the flooding marks to the map.