The acquired stores will be rebranded Schnucks. Schnucks is basically buying the cream of the crop; the rest of the stores face a very uncertain fate.
https://www.stltoday.com/business/local/schnucks-buying-shop-n-save-stores-in-generational-transaction-with/article_d66ebfc5-b7ad-50e7-8641-61dcb9df24a0.html
https://www.bizjournals.com/stlouis/news/2018/09/17/schnucks-buying-19-shop-n-save-locations-in-st.html
Those are the St. Louis area Shop n' Saves, not the ones around Pittsburgh.
Their status remains unchanged, so far as I know.