FWIW, my policy is to always prepare the laining, even if I know I’m not going to be actually laining that day (either because I’m away at a simcha or a Bar Mitzvah is laining in shul). I’m continuing to prepare each week and I read it from my tikkun at home on Shabbos morning.
As to what I will do when I finally go back to shul? Simple. I will ask the Rav of my shul what to do and I will follow his directives. If he says to read all the missed parshiyos, I will do so. If he says to read some of them, I will do so. And if he says to only read the current parsha when we return, I will do so.
The Wolf