Long answer:
By the Rules of Appellate Procedure, the government has 30 days to file an intent to appeal, which is not an appeal itself. 30 days from March 8 (the date of the decision) is April 7, which is a Sunday, so the real deadline is April 5. The government can also ask for an extension to file notice up to another 30 days. Filing the notice to appeal gives it another 60 days to file the actual appeal, although the government can ask for an extension of that up to 180 days. That may seem like a pretty slow process, but this case has been going since September 2020.
Short answer:
The government is going to have to file something by April 5 if it intends to do anything. "Something" won't necessarily be the appeal itself.
Meanwhile in my inbox today:
Um, no. The federal district court didn't say anything about a FOID. It ruled on part of the Gun Control Act of 1968.
It might have legal implications on the FOID, but we actually need to go down that road to go down that road.