I bought some RTD shakes from Costco and they have 30 grams of protein. I was going to do 3 of them a day and then a lean and green for dinner. Is 90 grams of protein too much plus my protein source at dinner??

You're pretty safe with 1-1.5 grams of protein per lean Lb of body weight.
Unless you're eating tons of protein with your dinner you should be ok.

Are they Premeir Nutrition? There are many folks that used these as alternatives... Read the stickies... They are there to help you!!