Lenin in the autumn of 1919 was so worried about the possibility of Pilsudksi coming to the aid of Denikin and Yudenich that he offered Poland very "generous" boundaries. "At the same time Lenin offered Poles the territories of Minsk, Zhytomyr, Khmelnytskyi, in what was described as mini "Brest"; Polish military leader Kazimierz Sosnkowski wrote that the territorial proposals of the Bolsheviks were much better than what the Poles had wanted to achieve."
http://www.newworldencyclopedia.org/entry/Polish-Soviet_War E.H. Carr in his *The Bolshevik Revolution 1917-1923, Volume Three* quotes Radek as saying that Poland was offered "White Russia as far as the Beresina" (in OTL Poland ultimately got only western Belarus) as well as "Volhynia and Podolia." This would give Poland, in Belarus, not only Minsk but territory as far east as Babruysk as well (see
http://www.freeworldmaps.net/europe/belarus/physical-map-belarus.jpg for a map) and in Ukraine it would leave them less than one hundred miles from Kiev. See
https://www.alternatehistory.com/fo...ts-bolshevik-peace-offer-in-late-1919.399289/ and the attached map.
IMO, however, these borders would harm rather than help interwar Poland. First of all, the area involved was very poor, and would be an economic burden on Poland. Second, the area was overwhelmiongly inhabited by Belarusians, Ukrainians, and Jews, and would therefore simply aggravate the "national minorities" problem of interwar Poland. To mention one problem: The Organization of Ukrainian Nationalists would have a larger popular base, and would probably carry out more terrorist acts than in OTL, and the Polish repression would probably be even more brutal than in OTL.
https://en.wikipedia.org/wiki/Organization_of_Ukrainian_Nationalists https://en.wikipedia.org/wiki/Pacification_of_Ukrainians_in_Eastern_Galicia (OTOH, a lot fewer Ukrainian would starve in the Holodomor.)
Leaving aside the eastern borders, there would of course be other effects of no Soviet-Polish War (assuming that the Soviets do not try to regain the territory they offered to Pilsudski by force once they defeat the Whites). For example, Pilsudski would not be the hero of the Battle of Waesaw (since there would be no such battle) which might diminish his later political strength.