Although the account is in good standing at this point in time: incomplete sentence.
A sentence can have any number of clauses, but it must have at least one main or independent clause. In this case, we face a dependent or subordinate clause, and they can not stand on its own. We identify the sentences as a dependent clause because begin with a subordinating conjunction: although.
Hope this helps.
No. A complete sentence, using the incorrect reference given, would be:
At this point in time, the account is in good standing.
yes it is a complete sentence