The question of how to determine how much you have in deferred losses due to wash sales might be best directed to TD which I believe is now part of Schwab.
perhaps you get a statement of your open positions showing tax basis at the end of any day you choose. for long positions, you would need to know what you actually paid. the difference between the tax basis and what you paid would likely be the deferred wash sale amount on long positions. For short positions it would be the opposite, what you sold them for vs tax basis.
I realized this may be impractical if you have many open positions. Perhaps Quicken or Quickbooks which would only be able to show you the taxable net gain or loss but not the deferred wash sale losses if importing/downloading of the transactions is possible.
Wash sales on short sales can be complex, if you like read this thread
https://fairmark.com/investment-taxation/capital-gain/wash/short-sales/
Perhaps you should consult a tax pro as to the advisability of making the M-T-M election if you qualify.
