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what are safe temperatures to introduce plants and fish into the pond?
i have been overwintering my hardy lillies and goldfish inside. they
are used to 20°C water. right at sunset the water is 15°C. in the
morning the temperatures drop to 12.5°C

can i put them in or should i wait?

(non-metric)

20°C = 68°F
15°C = 59°F
12.5°C = 54.5°F

Anything temp over feeding temp (50-55) is probably OK. But I'd probably
hold out for 60. Mine were in the pond all winter and they are just now
reaching temps similar to yours. I tried feeding them some wheat germ a few
days ago and duckweed yesterday, but no one was terribly interested.
Although there is the odd one sucking something (Algae?) off the liner.

Just make sure you SLOWLY match the tank water in your transfer bucket to
the pond water before you throw the fish in the pond. i.e. make sure the PH
and temp of your transfer bucket matches the pond water. Also check the pond
for Ammonia and Nitrates and allow time for your Biofilter to get going.