Yes, the cable car will be operate at that time. From Hung Hom, you can take West Rail line to Nam Cheong, then take Tung Chung line to Tung Chung Station. Then walk to the cable car terminal. It costs about HKD19. When go to Disneyland, you can back to Tung Chung to take MTR to Sunny Bay and then take the Disneyland Resort to get there. It costs HKD12.5. There is One Day Pass for travellers in HK. I think an Ordinary Octopus card is OK for you.