A weekly feature of Torah Tidbits to help clarify practical and conceptual aspects of the Jewish Calendar, thereby better fulfilling the mitzva of HaChodesh HaZeh Lachem...
Molad of Shvat was Mon. Jan. 10, 3:51pm Israel time. First Kiddush L'vana (3-day opinion) is Thu night Jan 13 weather permitting.
Motza"Sh will be popular for KL for those who  prefer (or insist) on Motza"Sh AND  aren't strict about the 7-day opinion. Strict 7-day after the molad people will have their first op on Mon. night, Jan. 17, eve of the 8th of Sh'vat.
Deadline for KL this month is Tue. Jan.25 (TU BiShvat) at 10:13am - meaning all Monday night, Leil TU BiShvat. That means that Motza"Sh B'shalach (Shira) is okay, but since it is the eve of the 13th of the month, one shouldn't wait for Motza"Sh, but rather take an earlier opportunity. It is okay (except for strict GR"A people) to wait earlier in the month for Motza"Sh, i.e. this coming Sat. nite, which is only the eve of the 6th.