No, that's not reasonable. You are going to hit rush hour traffic as you get near the 57 freeway. Best case, you will arrive in Anaheim around 10:00. More likely it will be well after 10am. Then, you have to park at either the parking lots or your hotel, and make your way through security and into the parks. What's your situation there? Where are you staying? That will determine what your arrival timeline will look like. Realistically, don't count on being inside a park before noon and be pleasantly surprised if you are.
Last time we drove back home (we live very close to Anaheim) from Vegas, it was a Monday morning and what should have been a 4 hour ride was a freaking 7.5 hour CRAWL home. There was construction, accidents, regular traffic. The whole enchilada. Tuesdays are bad now as well.