The street has not yet been officially renamed. The old signs are still hanging (https://www.mapillary.com/app/?focus=photo&lat=52.512225499972004&lng=13.391342799999961&z=17.542057728343067&dateFrom=2023-11-01&pKey=992401268949269&x=0.7030712284200934&y=0.3533300411063398&zoom=1.2773554811152026). 
The date of the renaming has not yet been determined (https://www.tagesspiegel.de/berlin/bezirke/fast-vier-jahre-nach-dem-beschluss-umbenennung-der-mohrenstrasse-in-berlin-mitte-verzogert-sich-weiter-11863142.html)