Does this sound like an emergency? Should I try and get my cat to a vet tonight?

My beloved cat seems unwell. Her purr sounds strange and raspy and she’s been coughing like she’s trying to get a hairball up (nothing has come up). We’ve also noticed her appetite has been a bit down lately, but she has eaten tonight. We can’t decide if it’s okay to wait till morning or if we should try and take her to a vet tonight. Any ideas?