to complete an official agreement or task, or arrange a business deal
conclude [with object]
Formally and finally settle or arrange (an agreement)
‘an attempt to conclude a ceasefire’
‘Negotiations to conclude a new agreement failed.’
As you will see from the excerpts above, one meaning of conclude is to finalise / complete / agree / settle a business or other multi-party agreement. So, the basic answer to your question is 'yes', “Contract concluded” does mean that it's been agreed upon.
If the contract had come to an end, it may have expired (e.g. on a preset date) or have been terminated (e.g. by one or both parties, according to criteria set out in the agreement).
Strictly speaking, if you are talking about the event (i.e. the making of the agreement) after it happened, then there should have been a verb in the past tense to create a proper sentence (e.g. contract was concluded). But the quoted wording (without a verb) would be normal form at the end of the agreement itself, especially immediately above the signatures of the parties to the agreement: here the present tense is applicable because they are actually making the agreement by adding their signatures.
P.S. As hinted above, you could have found the answer to your question quite easily by looking in a dictionary!