Recently I was faced an issue where one of my project was stuck in terminating state for days. The workaround below fixed the issue.
Export OpenShift project as an JSON Object
oc get project delete-me -o json > ns-without-finalizers.json
Replace below from
spec: finalizers: - kubernetes
spec: finalizers: 
On one of the master node, execute these commands.
kubectl proxy & PID=$! curl -X PUT http://localhost:8001/api/v1/namespaces/delete-me/finalize \ -H "Content-Type: application/json" --data-binary @ns-without-finalizers.json kill $PID