I was wondering when the next maintenance period for PSN would pop up, and now Sony has confirmed the date as Thursday 12th February. If you’re signed into the network prior to the maintenance period then you should be able to continue to play online, and access services. However, the PS Store and account management will not be accessible during maintenance.
The time maintenance is expected begin at 5pm GMT and is estimated to last until 8:30pm. Those in North America will have the maintenance from 9am PST until 12:30pm PST. So if you want to be gaming online during those hours make sure you are connected, or make other plans. I recommend watching Better Call Saul, though maybe finishing Breaking Bad first would be better if you haven’t.
Source: PS Support