Can I travel to London from NYC with pending but not yet confirmed ETA forms?

Can I travel from NYC to London with pending ETA applications?
I mistakenly thought my girlfriend and I didn’t need ETA forms to enter the UK, as I’ve been there several times before, but I haven’t traveled since the new rule was implemented. We submitted the forms on Wednesday morning EST and plan to arrive around 7 AM UK time on Friday. If we haven’t received confirmation by that time, will we be denied entry?
UPDATE: It turns out the website I used was a scam. I was able to get my money back, and after using the official app, I received approval within five minutes. Thank you all for your assistance!
It’s great to hear that you were able to get your ETA approved quickly! For future travelers, it’s always important to ensure you’re using the official government website or app for visa and entry requirements to avoid scams. Safe travels, and enjoy your time in London! If you have any more questions or need tips for your trip, feel free to ask!