Generally, no—the Nikon D3500 does not display the actual focus distance in Live View or in the viewfinder while focusing. Some cameras and lenses record an approximate focus distance in the photo’s EXIF metadata after the image is taken, often labeled something like “Focus Distance,” but that is not usually available as a live on-screen readout on this camera. Also, the recorded value may be approximate rather than an exact measured distance. So if you need that information, you would typically have to check the image metadata afterward rather than seeing it directly before taking the shot.