Short:
Assume never and you won't be disappointed.
Long:
Afraid I don't make promises or ETAs — I just work with the garage-door open.
Screenshots and gifs of whatever I'm making are freely available on my patreon-equivalent ko-fi site. (Linking here is against forum rules, but I think I can say it's accessible in the bottom left of sheets.flechs.net...). Development-builds of things are intermittently available to supporters.
Here's a quick overview of the past couple years: I've been making something fairly described as a rewrite of Flechs Sheets. Current development builds run in Chrome on desktop only and include features like manually marking Mechs, Vehicles and Standard Elementals, importing .mtf, .blk, and .mul files, and some equipment specific actions like setting alt-ammos, rates of fire, heat sink on/off, etc.; many passive automations (like MP calc) and some active automations like damage resolution and attack declaration and resolution against local units. There's been nothing posted resembling printing, tight sheet-like UI, anything network related, or any touch-screen device support. There's no comprehensive list of equipment coverage. I've also recommended against using development builds in real games as I can't guarantee stability.
There's also no public roadmap.
If you'd like to make guesses about what might exist when it may be helpful to know that Flechs Sheets as it exists (not the new thing) was several thousand man-hours.
Sorry if this info isn't the info you wanted. I hope it at least allows you to better make long-term campaign plans etc. ✌️
