We were able to get a bus to HS crazy early in the AM on Galaxy's Edge opening day, so you should have no problem getting there for standard rope drop. Note that at FW, you will need to take an internal bus that will drop you off at the main bus station where the park/resort busses pick up, unless you rent a golf cart. We stayed one night without a cart and rented one the next day so we didn't always have to wait for the internal bus.