SC 190 Notification of Interest

a) What is the difference between “officially invited” and “invited based on Expression of Interest - SC190” (https://myimmitracker.com/en/au/trackers/expression-of-interest-sc190) as I see the data for these two am little confused with the definitions.

b)Also, I have submitted my case with 65 points without ss, ICT business analyst and my effective date are 4th Mar 2018, for Vic and NSW. I have superior English scores. Any insight on nomination timeframe will be greatly appreciated.