My property taxes are not listed on my form 1098, how to determine the amount to deduct?

Hi there, it might be a rookie question but I am confused and I will appreciate your help.

I don’t pay my property taxes through escrow, and the amount is not listed on my form 1098.

In 2021 I payed 50% of the tax bill for the tax year 2020/2021 (in April 2021) and 50% of the tax bill for the tax year 2021/2022 (in October 2021). Should I deduct these two payments when doing my taxes for 2021?
Or should I deduct property taxes for the tax year 2021/2022 (50% already payed in October 2021 and 50% is still outstanding, I’ll pay it in a month or two, in spring 2022)?

 

I live in Santa Clara county, CA. It is a primary residence