It should be included in escrow if that's how you set up your mortgage. Form 1098 should report the real estate tax paid if that's the case. If you’re unsure, call your lender and ask.
You can also contact your county office. As long as the real estate tax was paid, you can deduct it, regardless if your document shows it or not.
Keep in mind, if your monthly mortgage payment includes an amount placed in escrow (put in the care of a third party) for real estate taxes, you can’t necessarily deduct the total amount. You can only deduct the property/real estate tax that was actually paid by the third party to the taxing authority, on your behalf.