Generate sql script on a given date

Good afternoon!

Well, I have a great mission that is as follows. I have a script that I set up below that I need it to be executed only on the 1st of each month, respecting the two conditions that I put in the IF clause. I tried via trigger and job, however, without success. What is the best way?

DECLARE @Tarefa int
SET @Tarefa = (SELECT Tarid from Tarefa)

BEGIN
IF (SELECT TarStatus FROM Tarefa WHERE TarID = @Tarefa) = 9 --ESSE 9 SIGINIFCA QUANDO O STATUS DA TAREFA TIVER CONCLUIDA
 and 
(SELECT TarTipID FROM Tarefa WHERE TarID = @Tarefa) IN (select EstTarTipID from EstoqueTarefa where EstoqueID = 47) -- ESSA CONDICAO SIGNIFICA NAQUELE DETERMINADO CAMINHO
  BEGIN 
   UPDATE EstoqueTarefa --ESSE UPDATE É PARA CHAMAR NESSA TABELA A INSERÇÃO DE NOVOS REGISTROS
   SET Ativo = 1 --1 SIGNIFICA PARA ATIVAR A TABELA PARA GERAÇÃO DAS NOVAS TAREFAS
   WHERE EstTarID = 570
  END  
END; 
  /*Produção Assistida Estratégico*/ 
  SELECT T.TarID,
       'DP-CustomerSu-47-970'  
FROM Tarefa T  
WHERE T.TarID = @Tarefa  
  AND T.TarStatus = 9