Yes, you can do that. In fact, you can make an estimated tax payment for 2018 up until January 15, 2019. You might still owe a penalty because you paid all the additional tax at the end of the year instead of over the course of the year, but if you pay now the penalty will be less than if you wait until you file your tax return.
See the FAQ at the following link for instructions to enter estimated tax payment in TurboTax.
https://ttlc.intuit.com/questions/1899271-where-do-i-enter-my-estimated-tax-payments
