Personally, I think there is a chance, but no guarantees. 'Ohana is well known for running behind schedule, especially later in the evening. Waiting 45 minutes past your ADR time is not uncommon, so assuming that happens, you might not be seated until close to 10:00 pm. After that, I've found that it takes between 60 and 75 minutes to eat. So that should mean you'll finish up somewhere around 11:00 pm to 11:30 pm, depending on how quickly you eat. Then it's a matter of getting back to the MK (monorail or boat), through bag check, and into the park.