i assume that only helps me with change fee, wont help put me on flight with no award availability?
Instead of sitting here and assuming, go get started on the process (before you lose tomorrows space).. You always have the option of canceling within 24h if you don't get what you want.
From the United Weather Waiver
page:
The change fee and any difference in fare will be waived for new United flights departing on or before March 24, 2018, as long as travel is rescheduled in the originally ticketed cabin (any fare class) and between the same cities as originally ticketed.
As long as there are unsold Business Class seats, they should re-book you on that.
After your flight is booked, there might even be an option directly on the UA website to process the change (without having to call).