We've just updated to PHP7.4 and it seems to be working ok, but without extensive testing it is hard to know.

PHP 7.4 is not even listed on the requirements and compatibility page.

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Not yet officially. If you want to track progress you can subscribe to the ticket at https://lab.civicrm.org/dev/core/issues/1496 and its subtickets.

If you find some issue feel free to report it in a ticket there.

The money_format issue might be something you could look at. If you're testing I'd look closely at how money amounts are formatted on the screen and in receipts - that kind of thing.

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