How Can I Check If I’m Gaming at 1080p?

I'm considering getting the game Clair Obscur, and I've added it to my wishlist to catch any sales. The recommended specs mention needing an AMD Ryzen 7 5800X and an AMD Radeon RX 6800 XT. I actually have a Ryzen 7 5700 X3D and an AMD Radeon RX 6750 XT. According to Steam, these specs are tailored for 1080p gameplay at 60 FPS with high settings, which sounds great to me. I'm curious, though, how can I confirm if my system is running at 1080p? And if it turns out I'm not at that resolution, how would that affect the recommended settings? Since my hardware is slightly below the recommendations, but I'm not too fussed about hitting 1080p, will I still be able to run the game smoothly, or should I consider upgrading?