query size/count of temp table

I have a run longing script (30 days) and I want to see the progress/size of one of the temp tables

however this doesn't work

select count(*) from [tempdb].[dbo].[#DataToDeleteTable]

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its says

Database name 'tempdb' ignored, referencing object in tempdb.
Database name 'tempdb' ignored, referencing object in tempdb.
Msg 208, Level 16, State 0, Line 8
Invalid object name '#DataToDeleteTable'.

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I've also tried

SELECT COUNT(*) 
FROM #DataToDeleteTable

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but get

Msg 208, Level 16, State 0, Line 5
Invalid object name '#DataToDeleteTable'.

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if i run this

select * from tempdb.sys.objects

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I see the name

#DataToDeleteTable__________________________________________________________________________________________________000000005144

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How might I get the count of this temp table?