If one swallows the SDAs "Great Controversy" thinking, then we gotta get everyone saved at this moment. In reality, this is not the only day of salvation, there is a Great White Throne Judgment and many will brought up in it and brought into God's Family at that time.
Rev 20:11 And I saw a great white throne, and him that sat on it, from whose face the earth and the heaven fled away; and there was found no place for them.
Rev 20:12 And I saw the dead, small and great, stand before God; and the books were opened
: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books
, according to their works.
Same criteria for judging then as now. What is written in the Bible, the books, all 66 of them.