Late to shul on Rosh Chodesh?

Hi,

We have said that Hallel is meant to be recited on Rosh Chodesh with a minyan, to the point that some question whether one who recites Hallel alone should recite a berachah upon Hallel or not.

Therefore, one who comes to shul on Rosh Chodesh just before Hallel should recite Hallel with the minyan before reciting the rest of davening. Further, one who is in the middle of psukei d’zimra when Hallel begins should recite Hallel, without a berachah, before continuing psukei d’zimra.

(Mishneh Berurah 422:16, Aruch haShulchan Orach Chaim 422:8)

Have a great day,
Mordechai