My property tax for 2020 was paid to the county in January 2021, however I paid monthly escrow payments for the taxes in each month during 2020. Can I still deduct it ?

You should be using the amount your lender put on your 1098.

Property taxes are deductible in the tax year they are actually paid. It does not matter what year is paid *for*.

Money you put in an escrow account is never tax deductible, or even reported anywhere on a tax return. Money you put into escrow is your money, and it remains your money until the administrator of the escrow account makes a withdrawal from that escrow account to pay an expense which the account was established for.  Expenses paid from that escrow account are generally reported to you on a yearly escrow analysis statement you receive every year around the anniversary date of the loan.  But nowadays most lenders will include amounts paid from escrow on the 1098-Mortgage Interest Statement also. Usually in box 10 of the 1098.