Stan, by default the pictures are added to your Picture Library. If you open Windows Explorer, you will see a Quick Access section on the left. Click Pictures. There you will find a folder whose name is today's date with your new pictures and videos in it. The program optionally lets you pick another location for future imports, and offers various choices regarding folder naming, or no folder at all. Last but not least, the summary page after import, in the program, has a link that you can click and which opens an Explorer window right on your newly imported pictures.

Unfortunately, this is how device content enumeration works: first all the files need to be found, then any new (and interesting) ones are selected for import. Android devices - unlike iOS or Windows devices - tend to return all files on their storage medium, not just photos and videos, despite the MTP requests being made specifically for photos & videos. Enumeration can take a bit of time because of that (thus the message). If no error is displayed, the program is making progress. It should not take that long, though, I'd recommend restarting your mobile device (full shutdown, power off and restart) and trying again. Additionally, if your device supports USB 3.0, I also recommend using a USB 3.0 cable and making sure you plug it directly into a blue USB 3.0 port on your PC, this plays a significant role in achieving the device's speed potential.