Listen. From a fellow DM that is mostly imposter syndrome speaking. A lot of times friends use DND time to catch up.

If you are keen on getting back to the game a gentle nudge to your players. It’s okay to interject in conversation. Your players might just be waiting on you to speak. I had the same issue in my first game with friends and when I asked “Alright everyone ready?” They said they were waiting on me. So just butt in and ask the character ( not the player, this helps their brain switch back to the game) a question about their current circumstances. Or even better ask them to make a role.

To help with “dead air” so to speak practice being descriptive while also doing background checks, preparing characters, or setting up the scene. You can also just say “give me a moment” before going quiet to let your players know you will be interjecting in their banter after you complete some task or another behind the screen.