you can join the server and hold tap and see your name if it blue or no or hold q and you can see on top mid screen if you have it in green and when it will end
or go to bans https://bans.perpheads.com/ and search for your name you will see if you are premium or no (might not work if you never receive ban/warning/blacklist)
Hold Q, at the top of your screen it will tell you when it does or has expired.
If you have brought it and it has not updated, go to the City Hall, turn left from the front desk and there is a "library" room where the person behind that desk will verify it and update it for you.
Depends how you look at it, higher salary means more money just putting itself in your bank.
More drug pots mean more drugs growing which means more profit.
2 free spins also at casino, where you can win a supercar or millions, which is where all my money comes from.
In terms of free car, you get a free VW beetle for joining the discord server, and a mini cooper for $1,000 if you complete all the starter missions on the 'Missions' app on your phone.