This is an iFruit boot theme, imspired by GTA5 and MacOS.
Assuming the unzipped ifruit theme folder is located in your download directory. Copy the finished theme to /usr/share/plymouth/themes:
sudo cp -r ~/Downloads/ifruit-colour-main/ifruit /usr/share/plymouth/themes
After copying, get a list of the installed themes with the following command:
plymouth-set-default-theme --list
Set it to iFruit theme:
sudo plymouth-set-default-theme ifruit -R