「彼らはすでにそこにいて、数分以内にそれに取り組み始める」とは対照的に書くつもりだったと思います。
あなたは本当に自分自身を教育する必要があります。あなたは英語の文法を理解していることを理解しています。
I believe you meant to write "They're there already and are going to start working on that in a few minutes " as opposed to "There their already and are going to start working on that in a few minutes".
You really need to educated you're self. You're understanding of English grammar leaves much to be desired and your embarrassing you're self in front of everyone.