Looks good. Have you thought about trying "assisted pollination". I have a similar looking one, Philodendron "Hendersons Pride". It's a hybrid between P. wendlandii and P. tortum as the pollen plant. Yours probably has P. tortum as one of the parents too. The spathe on mine is a creamy white.

Are they self fertile? I don't have anything that would be able to pollinate it otherwise.

That's strange, I replied but nothing showing. Maybe I forgot to click on Submit. What I'd said was that I didn't actually know, and as a hybrid it could be sterile anyway. But if you're into that sort of thing it could be worth doing to experiment. (Now to remember to click Submit.)

I'll have to wait for the second one to open, this one was closed last night.

You can cut out part of the spathe to see if there's any pollen on the
spadix. If there is then you can also cut a hole into the "chamber"
where the female flowers are on the bottom of the spadix and apply the
pollen. In some the females are receptive before the males produce
pollen, then you'll need to work it out with another flower.