If they are showing a piggyback date of 10/3/2019, then this means that the form 211 has already been approved as of 9/3/2018 when we went from the Grey Sheets onto the Expert Market. There is no other reason for OTC markets to post those dates.
The OTC probably knows that SOLI probably has everything ready to be filed and is set to launch. And they likely know that FINA approval will coincide with publishing quotes.
So it's all in the bag for SOLI, a great company and people getting it to market (like SEC, FINRA & OTC) know it too.