Clarification: I just meant this in the sense of: It should be fairly easy. :-)
The conversion has been slow and steady, where they convert a few pages, and then fix any newly discovered edge-case bugs.
The process is documented at https://www.mediawiki.org/wiki/Flow/LQT_conversion_process and tracked here at T92303: Convert LQT pages on MediaWiki.org to Flow (tracking).
This is also easier than T106302: Convert LQT->Flow on se.wikimedia.org, since (like MW.org) fiwiki is also an opt-in LQT wiki. So it's basically the same as MW.org, except you benefit from all the kinks we worked out there.
Plus, there are only two pages, both of which are short.