From the Form 8855 instructions, which apply to this case because they want the trust to be taxed as part of the estate:

When To File
File the election by the due date (including extensions, if any) of the Form 1041 (or Form 1040-NR, if applicable) for the first tax year of the related estate (or the filing trust). This applies even if the combined related estate and electing trust(s) don't have sufficient income to be required to file Form 1041.

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And as I read it, the election applies only to the first two years of the estate, starting from date of death. So, in this case, the end of this month. Might not be helpful if nothing has been sold yet.