The phrase "early days" refers to the beginning or initial period of something. It suggests that not much time has passed since the start, and there is still a lot more to learn, develop, or experience. Full definition
I'm in early days of doing what needs to be done to put my 111 + year old home and farm on the market so I can move 300 miles. (theinspiredroom.net)
I can't say [what genre], but certainly we are in early days now of working on it. (io9.gizmodo.com)
But it's a lot different from earlier days where it had to be hard - coded to that platform's specific architecture, the exact chips it's using. (bytesizeimpressions.com)