How to interpret the values of the current position of the joints?

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Hello,

get_current_joint_values()

With this function, you will get coordinate in the radian form stated by the standard ros coordinate system.

to angles like on the picture?

In the picture, you are seeing the angle of every axis that coordinate system is degree coordinates of robot.

Now, You just have to convert radiant coordinate to degree coordinate and you will get the degree of each joint as shown in the picture.

degrees = radians × 180° / 3.1415 # 3.1415 = π

or

You can take the help of online tools for converting radiant to a degree.