My iPhone has been hacked?

I was recently on safari and a pop up showed up and said “you iPhone has been hacked take immediate action” and I was dumb and pushed the close button and downloaded the app that they told me to download, not knowing it was a scam obviously. Is my phone really hacked? I deleted the app right away and closed all my tabs and shut down my phone. Will it be alright? Or what’s the next move to remove the hacker?