No idea what Hdmi version it has. It might be 2 but have a feeling it's 1.4.
Before buying a monitor, need to try one in store if you can, a model known to be capable of doing 120Hz+ over Hdmi. If laptop's Hdmi is v2, you'll have a good chance it working with a Hdmi 2 120Hz+ capable monitor. Hdmi v1.4 monitors are older and most likely be difficult to find in person. Even if manage to find one online, it would still be a risk of it not working because the cpu's integrated graphics generation (Intel® UHD Graphics 620), which the 1050Ti passes through, is limited to v1.4. Not that the port version itself is limiting because there are v1.4 144Hz monitors out there, it's just Intel themselves limited it's graphics controller to 60Hz...