Since the filing deadline ends on April 17, 2018, the IRS will wait until then to start sending notices. However, if you requested a payment arrangement the IRS will send you a bill with all the information you need after they process your return. If your return was accepted less than 21 days ago, it can take anywhere from a few days to 3 weeks to go from acceptance to approval. This timeframe is unrelated to how, where, or when you filed and it isn't connected to last year.
IRS representatives will be able to research the status of your refund if your return was accepted (received) more than 21 calendar days ago. Call them at 1-800-829-1040, but prepare for potentially long wait times.
You can also register and view your account on the IRS.gov website: https://www.irs.gov/payments/view-your-tax-account
