you can use TT taxcaster to estimate where you stand tax wise for 2019.
https://turbotax.intuit.com/tax-tools/calculators/taxcaster. this is really 2018 but it should give you a reasonable estimate for 2019.
an oversimplification but generally penalties can be avoided if there was timely payment of estimated taxes. (unless specifically allocated withholding taxes will be allocated equally to each quarter).
estimated taxes are due 4/15, 6/15, 9/15 and 1/15 of following year. the actual date will be later if the 15th falls on a saturday, sunday federal or certain state holidays.
if timely withholding and estimated payments, there will be no penalty if you have paid in 90% of current year tax or 100% (sometimes 110%) of last year's tax
also if your required estimated tax payments are less than $1,000
