Prayer is a great and integral work of gathered worship.
From a longer article by Rick Phillips:
Acts 2:42 says the first believers came together for “the prayers.”
The definite article suggests that they came not merely for prayer but for special prayer gatherings.
This why the prayer meeting shows the spiritual strength of the church.
But we also come to Lord’s Day worship in order to pray together.
We do not merely come to complain about life or about the evil world, but to pray to God for his Spirit to empower the gospel in order to save many.
We pray for our own needs.
We pray for God to be glorified.
We pray for the great issues of our day and for the small concerns of our lives.