Yes. OCSP is mandatory for EV. Our instructions also provide information on how to enable OCSP 'Must-Staple' to ensure that future connections from browsers expect proof that the certificate is still valid.
If you'd like to test out OCSP support, try:
openssl s_client -connect certsimple.com:443 -status
The OCSP response is just after the connection:
OCSP response: ====================================== OCSP Response Data: OCSP Response Status: successful (0x0) Response Type: Basic OCSP Response Version: 1 (0x0) Responder Id: F825D9A639C7C38187253E3054911821409B179D Produced At: Feb 27 05:21:00 2017 GMT