Do you have one of those plastic tubes on a stand that you use for taking a reading?
If so, put some water in it (check the water temp first) and check out the reading. If properly calibrated it should read 1.000 at 60F. A general rule is you add .002 for every 10 degrees.
Do you recall what your Original Gravity (OG) was?
Everything is relative to the type of beer you are making. If your reading is now at 1.020 you are probably still too high and have more fermentables to go.
If you started out at 1.056 OG then your target FG should be somewhere under 1.014 (your 56 divided by 4 = 14 (or about 75% of your OG)).
A lower FG (such as 1.008) will give you a bit more alcohol and make it taste drier.
The formula is as such:
OG minus FG = times=potential alcohol
(1.056 - 1.008 = 48 x 105 = 5.040 %)
I always use the tube to measure the gravity and the temp so I know how to manipulate the numbers. Afterwards I sample it and write a small critique as to how I feel the brew is doing. Sometimes I'll write something like "a tad too sweet yet", "should be lots better in two weeks", etc.
Now there are many people who will insist a hydrometer is a waste of time. Well, to them, it is.
I use my hydrometer. You don't have to. I enjoy doing all the little steps, even the menial ones. It let's me know how close I am to re-creating a previous recipe or hitting another one on the nose. Of course, those terms are all generalizations also. I could be wrong, your mileage will definitely vary from the manufacturer's recommended sale price, and batteries not included. Not responsible for stains which cannot be removed with a double dose of the stains original ingredients.
I am just answering your question. Do what you want with the information.
Either way, enjoy your brewing and good luck.