Review Pre-Opening ADR at MK

[CookieGVB]

We are staying offsite in Indian Creek for the first time. We have an 8:00 ADR in the MK. Will the monorail run from TTR early enough to get us there if MK doesn't open until 9:00? I know resorts run early buses, even though the standard answer is that they start running an hour before park open.

What's my best course of action? Would I be better off valet parking at the Poly, since our night ends there at 'Ohana? Any advice would be appreciated.