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Find a proper contractor, not cap ayam one

Proper way:

Concrete casting
Screed no need since you going to tile, you need a rough surface
Wait 2 to 4 weeks
Tile it.

By right u need wait 4 weeks to cure, but some especially ready mix concrete will reach 28 days strength in 14 days.

If ur client, you should enforce the proper method else risk cracking tiles popping, who's paying the money?

If ur contractor, u should do that too, else risk redo / reputation, viral, tribunal, even if no contract signed, the law ensures work is properly done.

Is better if you can water the concrete slab daily starting from 24 hours after finish casting

u pay contractor idling, they can wait for you 14 to 28 days also can.

or u give them work order do something else while waiting for curing.

but in real life, ask contractor do wet lay on screed (use mortar not adhesive), 3 day curing between laying screed and tiling ok already.