Seeking help to improve this query performance.

SELECT DsJobStat.JobName AS JobName     , AJF.ApplGroup AS GroupName     , DsJobStat.JobStatus AS JobStatus     , AVG(CAST(DsJobStat.ElapsedSec AS FLOAT)) AS ElapsedSecAVG     , AVG(CAST(DsJobStat.CpuMSec AS FLOAT)) AS CpuMSecAVG  FROM DsJobStat, AJF  WHERE DsJobStat.NumericOrderNo=AJF.OrderNo  AND DsJobStat.Odate=AJF.Odate  AND DsJobStat.JobName NOT IN( SELECT [DsAvg].JobName FROM [DsAvg] )          GROUP BY DsJobStat.JobName , AJF.ApplGroup , DsJobStat.JobStatus HAVING AVG(CAST(DsJobStat.ElapsedSec AS FLOAT)) <> 0; 

Execution message,

(0 row(s) affected) Table 'AJF'. Scan count 11, logical reads 45, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table 'DsAvg'. Scan count 2, logical reads 1926, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table 'DsJobStat'. Scan count 1, logical reads 3831235, physical reads 85, read-ahead reads 3724396, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.  (1 row(s) affected)  SQL Server Execution Times:       CPU time = 67268 ms,  elapsed time = 90206 ms. 

Tables structure,

-- 212271023 rows CREATE TABLE [dbo].[DsJobStat](     [OrderID] [nvarchar](8) NOT NULL,     [JobNo] [int] NOT NULL,     [Odate] [datetime] NOT NULL,     [TaskType] [nvarchar](255) NULL,     [JobName] [nvarchar](255) NOT NULL,     [StartTime] [datetime] NULL,     [EndTime] [datetime] NULL,     [NodeID] [nvarchar](255) NULL,     [GroupName] [nvarchar](255) NULL,     [CompStat] [int] NULL,     [RerunCounter] [int] NOT NULL,     [JobStatus] [nvarchar](255) NULL,     [CpuMSec] [int] NULL,     [ElapsedSec] [int] NULL,     [StatusReason] [nvarchar](255) NULL,     [NumericOrderNo] [int] NULL, CONSTRAINT [PK_DsJobStat] PRIMARY KEY CLUSTERED  (   [OrderID] ASC,     [JobNo] ASC,     [Odate] ASC,     [JobName] ASC,     [RerunCounter] ASC ));  -- 48992126 rows CREATE TABLE [dbo].[AJF](       [JobName] [nvarchar](255) NOT NULL,     [JobNo] [int] NOT NULL,     [OrderNo] [int] NOT NULL,     [Odate] [datetime] NOT NULL,     [SchedTab] [nvarchar](255) NULL,     [Application] [nvarchar](255) NULL,     [ApplGroup] [nvarchar](255) NULL,     [GroupName] [nvarchar](255) NULL,     [NodeID] [nvarchar](255) NULL,     [Memlib] [nvarchar](255) NULL,     [Memname] [nvarchar](255) NULL,     [CreationTime] [datetime] NULL, CONSTRAINT [AJF$  PrimaryKey] PRIMARY KEY CLUSTERED  (   [JobName] ASC,     [JobNo] ASC,     [OrderNo] ASC,     [Odate] ASC ));  -- 413176 rows CREATE TABLE [dbo].[DsAvg](     [JobName] [nvarchar](255) NULL,     [GroupName] [nvarchar](255) NULL,     [JobStatus] [nvarchar](255) NULL,     [ElapsedSecAVG] [float] NULL,     [CpuMSecAVG] [float] NULL ); 

Execution plan https://www.brentozar.com/pastetheplan/?id=rkUVhMlXM

Thanks advance