Confusion

I started a new job 3 wks. ago as an accounts payable manager. The office is closed so I'm working remotely. Week 1 I reached out to my boss to see if there was an onboarding plan and what I needed to do outside of the HR onboarding documentation, but I got no response to the phone call or e-mail. I decided to reach out to the team I'm responsible for managing, and set up time to virtually meet them and shadow some of their tasks. Week 2, I signed up for a few webinars the co. was offering, reached out to the team and asked if there was anything I could help with. One co worker responded and said that he'd touch base w/ me next week and that he appreciated me asking and my enthusiasm to jump in. So week 3 I get a meeting invite from my boss. I accepted the invite and asked him if there was an agenda. No response. I got on the Zoom and he stated that this is my show to run the department the way I see fit and that he just wants me to send him a weekly e-mail detailing what I'm working on. I'm just a little confused because it's like some magic trick. He was M.I.A. for weeks w/ no communication, and now he's here and oh by the way what am I working on. I'm not really sure what I should be working on, but I'm here to assist is what I told him. He repeated that this is my thing to run. Okay cool, but I've reread my job description and it's vague; it says setting and facilitating the achievement of dept objectives, building and maintaining internal and external relationships, hiring and motivating staff, and other duties as assigned. I my boss what were some pressing tasks and goals in the next 60-90 days. He stated closing the financial books in 6 days. Okay, then I asked my boss if there was an org chart. I figure I can look up a few people on the org chart that directly interact with the dept, introduce myself, and try to get a lay of the land. He couldn't tell me if there was an org. chart. I want to succeed here and I'm not going to send blank weekly updates of what I'm working on, but there needs to be better, more direct communication.