Pay today, is it appropriate to say resignation today?

There is no question of when it is appropriate to resign. Now that you have decided to resign, you must declare your resignation 30 days in advance and go through the formalities when it expires. You can also negotiate with the company. If you agree, you can leave on the same day or in a few days, but you can't miss 30 days. Once the unit refuses to let you go for more than 30 days, it is illegal.