Douglas, in this current sustained high demand and low supply market, there is no telling. Just add it to both your Wish and Notify Me lists for email notification when back in stock. I would check on large gun and accessory sites like (6)un (8)roker, Armslist and Guns America as discontinued and hard to find firearms and accessories show up for sale by private individuals and small shops. Just replace (6) & (8) with G & B.

Found another in stock here
https://battlehawkarmory.com/product/ruger-5855-mini-14-ranch-223-rem5.56-nato-18.50-51-blued

NO ETA due to COVID and high demand. CHECK G(un)B(broker), they have A LOT of MINI 14 available. I hope this helps.

Unfortunately buds doesn't get ETAs in when if an item will be back in stock, especially in the current market.
Best bet is to hit the notify me when available button, and act quickly when you get that email.
Or if you need one sooner,
In stock and ready to ship here
guns.com/firearms/rifles/semi-auto/ruger-mini-14-tactical-223-rem-5-56-nato-semi-auto-20-1-rounds-16-12-barrel-7-5-lbs-new?p=102414
You could also check out the used market like Armslist.com, or (G)un Br0ker