Yes you can use the 2019 taxes paid in 2020. The deduction is based on when you pay it.
You can claim prior years' property tax in the tax year you paid them. For example, if you paid your 2019 property taxes in 2020, claim them on your 2020 taxes. However, you can't include any late fees, interest, or penalties—just the tax itself.
Starting with tax year 2017, you can still claim prepaid property tax but only if it was also assessed in the tax year you're attempting to claim it.
In other words, if your local assessor sent you the 2021 property tax bill in 2020, and you paid it by December 31 of 2020, you can claim it on your 2020 return.
However, if you didn't get an assessment for your 2021 property tax, but you went ahead and paid it anyway by the end of 2020, you can't claim it on your 2020 taxes (but you could on your 2021 taxes, assuming you get assessed in 2021).
Use this Link for more details:
Can I Deduct Property Taxes Paid for a Prior Year
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