Bus from Yan'an to Hukow waterfall

Dear Sir/Madam
I am advised from this Q&A that I need to go to North Bus Station of Yan'an from the Yan'an airport in order to go to Hukow waterfall on Novemver 3, 2024. I have a question that since I arrive at 11am, I am afraid there is no bus available from the bus station and there is no way I can find the bus time table. Would you please let me know if there is a bus to go to hukow waterfall in the afternoon and what time would that be? And if there is other way more fast, please let me know. Thank you.