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Using the same time zones across devices should allow the “out-of-box formatting options” read the correct date for “Today”, per my test.
Check your local computer regional settings (Windows Settings > Time & Language > Date & time) and make sure the time zone matches the regional settings for this SharePoint site via Site Settings > Regional settings > Time Zone. Also remove your personal regional setting if any.
Please note: The column formatting for SharePoint Online uses only @now and Today is not supported.
You can see the JSON code by clicking “Advanced mode” on the “Format this column” pane.
References: "@now ". / Formatting an item when a date column is before or after today's date (advanced).
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