How to determine long term capital gains before sell

I am trying to figure out the best way to determine how much of a coin that I hold will qualify for long term gains (held over a year) at any given sell date. So if I am think of selling in the near future, how much can I sell, but not dip into assets held less than a year. FIFO cost basis.

I was playing with the calendar on the dashboard. And it looks like if I set a start date to the beginning of my crypto journey and an end date of a day I am thinking of selling - 365 days, this displays the adjusted numbers for cost and holding up to that period, I think?

Can anyone confirm this, or give me another way? Looks like all the reports only report numbers AFTER an action takes place. Thanks!