While the government has been reopened after a long shutdown, they were still set to remit tax refunds to taxpayers during the close. Many IRS workers who were ordered back to work to process refunds stayed home, so it is unknown how this would have impacted the timeliness of refunds.
Another factor you may need to consider is that your state may not be ready to file. Many states are rushing to finish finalizing their tax forms for the changes in the new tax laws so they will not be ready to accept forms for a while longer. This will vary on a state-by-state basis so check with your tax preparer or your state department of taxation to learn more about when you can file.