App to show keyboard shortcuts being used real-time
Keycastr (Open-source, free)
Mouseposé (Annual subscription, additional mouse features, free trial available)
Keystroke Pro (Paid, no subscription, light/dark themes, focus on design, free trial available)


You can alternatively show the on-screen keyboard but this is extraneous for my use case.



Note: These apps are all listed in this question which specifically refers to screen recording.