Re: aregross
There are definitely 32 bit Meltdown/Spectre patches available now.
Looking at https://support.microsoft.com/en-gb/help/4073757/protect-your-windows-devices-against-spectre-meltdown (there's a section explicitly for 32-bit Windows) and https://support.microsoft.com/en-us/help/4088878/windows-7-update-kb4088878 I think they went on general release with the March patch Tuesday.
I remember (no link, sorry) seeing them offered an an out of band not on general release update perhaps in late January or Feb.