not sure to be honest, because you're forgetting to factor in the following fact: russians are fighting successfully in areas which have been officially annexed into the russian federation.  so they have a legal incentive to pour a lot of military effort into "liberating" territories which are legally part of russia now. the dnipro region isn't legally integrated into russia (at least yet), so i have concerns that they might not pursue it even if it's out in the open and defeseless. (i know this is totally dumb, but that's how russian war politics always worked. they also stopped short of entering tbilisi in 2008, despite facing zero obstacles to doing that. it just wasn't part of their goals, and this means a stop to the operation) i think after russians cross into dnipro region they might probably set up a few hqs and logistics, which will assist them to strike the remaining ukrainian forces in donest and zapo regions.
Lithuania