The spouse tax adjustment will be automatically calculated in TurboTax if you enter each spouses wages properly in the program. Just make sure you indicate which spouse's income you are entering.
Married couples filing jointly on Form 760 could see their tax decrease by up to $259 with the spousal tax adjustment. Joint taxable income must be over $3,000 and both spouses must have taxable income to benefit from this adjustment.
You can learn more about the tax credit here:
https://www.individual.tax.virginia.gov/calculators/spouse-tax-adjustment.cfm