Can I refrigerate chocolate buttercream to use tomorrow?

I'm not in the habit of making buttercream frosting, and when I have I've made it the day I use it. But I'm hoping to make some chocolate buttercream today to frost cupcakes tomorrow. Not a meringue buttercream. cocoa powder, confectioner's sugar, vanilla, milk, and butter.

Can I make it today, refrigerate it overnight, and take it out of the fridge early to warm up?

And if anyone knows what the missing step 2 is on this recipe, please let me know for sure. I assume I just need to add slightly soft butter in pieces once I've mixed the other ingredients.

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