Although a bit misleading, this just means that you must wait for the Maryland tax forms to be updated before you can file your state tax return, which will happen automatically with online TurboTax, no need for any action on your part other than to check back weekly. (Updates usually occur late on Thursdays, so check on Fridays.) The update is necessary because you are apparently itemizing deductions on your federal tax return and you have deductions for state and local taxes entered. The adjustment needed for this on your Maryland Tax return has not yet been approved for filing.
