Cat ingested Yellow oil paint-Help please

My cat stepped in my yellow Windsor and Newton oil paint and I very quickly scrubbed his foot and washed with dawn dish soap but it’s still very stained yellow and he is licking it and I’m worried he might have ingested the paint. I will definitely not paint with him in the room anymore and prior to the google search I did after this incident I did not know it was so toxic. Should I take him to the vet immediately or is it okay to wait and monitor him and see if he starts vomiting?