If the cell value is equal to today's date, then it should appear red as part
of the conditional formatting.

If D3=today(), then red/bold.

For insurance policies that will expire in the future, I would like a
formula to let me know when that date has arrived.

The cell date is that expiration date, so if I change that date to test my
formula, I find that it did not work.

What would be the best way to assign the formula?

Thanks in advance for your help.