Do we have CAT2 tcode available as a Fiori App?

We are currently wanting to implement Timesheets Fiori apps on S4HANA.

Me not being an expert on HCM, would want to know if CAT2 tcode is available as standard. I understand My Timesheets app is an alternative for CATS tcode.

Can you please explain or guide on how to go about the implementation?

Both Tcodes are currently being used widely by the client. They need to be replaced or replicated on Fiori. How can this be integrated?