I haven't run on integrated graphics in forever, so I was worried it might have awful performance, especially considering it's Intel
But it looks like things should be able to run at 720p at a reasonable framerate
https://artofpc.com/review/intel-uhd-770/
If you do decide to add a GPU later, you may want to consider upgrading the power supply at the same time. The rule of thumb I use is that the power supply should supply double the power that the machine is supposed to consume (Which you've already done here for the current build)