Per the last 8K (see link below) it will occur 20 days after SBFM mails the Definitive Information Statement to shareholders. The main reason for the RS is to meet the Nasdaq minimum bid price so they don't get delisted (which was going to occur this week). They are appealing so they now have until April 25th when there will be a hearing.
So, looks like it is likely to occur later in March or early April.