Just want to know that is my treatment is going on the right way? (photos)

I am 24 yr old female and i am under treatment for last 6 months.i have an extraction gaps on both side of upper jaw.Yesterday my ortho instructed me to wear rubber bands in a triangle shape and also fixed a pallete on my upper jaw .As i have an overjet and crowding in lower jaw .please let me know what this pallete is for and is my treatment going on right way .How long does it take to finish my treatment

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