Parent passing away - how to ask for flexibility [Portland, OR]

Hi everyone. My dad is in the process of passing away. He lives in Seattle and I live in Portland. It’s difficult because there’s no clear timeline for his death but I want to be there as much as possible. At this point we know it’s days or possibly weeks, but he’s declining fast and it looks like death might be imminent. I’m actually on the way to see him right now because he’s asking for me.

My firm offers five days of bereavement leave which I plan on taking starting the day after his passing.

The firm allows two days of WFH per week and three days in office. This job can be done entirely at home (accounting) but they want new hires to spend more time in office. This is my second month working at the firm.

I have a good relationship with HR (I think) and everyone that works there who I’ve met so far.

I want to ask HR for a flexible work schedule for the immediate future because I want to spend time with my dad in his last days. However, I can’t give them a definitive timeline and it’s not impossible he continues to live for a couple weeks.

How would you recommend approaching HR with my request and what are the range of likely outcomes? What would you do in my position? Thank you.