Hey! To be honest with you, yeah, it's late to submit the primary now... I know the primary deadline is Dec 31 2020 but by now most MD schools in the USA, including Wayne, already have conducted or handed out almost all of their interviews so I would say it's best to wait until the next cycle. You would spend tons of money applying for minimal or no returns.
However it isn't too late to submit a primary for DO schools right now. I would say go for it if you have a very solid application and can write good essays. I would get on it asap lol