A lot of universal remotes support Roku TVs. You can also buy the Roku simple remote for TVs or one of the voice remotes. You can't use the app as a remote until the TV is connected to your network and the only way to get it connected is with a physical remote.
Roku simple TV remote:
Roku TV Remote | Replacement Remote For Roku TV | Roku
All Roku remotes (note that there's two $9.99 remotes; only one works for TVs):
Roku Accessories | Streaming Accessories for Roku Devices & TVs | Roku
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