You may see a '?' symbol in the Farm Club Companions rewards screen, and be unable to collect the final rewards. This is because after level 1110, there are no further Companions.
But don't worry! The levels are adjusted so you won't need them, so you can still enjoy the challenge of the game with all the skill and experience you've built up.
This also means you'll be able to save more Magic Beans to get helpful Shovel Boosters, which can be added just before any level begins!