For just the results. Decision Desk HQ gets updated quickly, as they provide data to media outlets and others. I don’t think they require a subscription just for results. The AP does the same and generally “calls” states anyway. (As in, the networks will call the results when the AP does, though some have extra requirements like their own data team agreeing.)
The federal government doesn’t run the elections so you’d have to check the 51 Secretary of State (or equivalent) sites to actually get live results.