How to check success of SELECT query that has no output - sql

Question

I am trying to check to see if the query was successful to process the results, and if not, skip the processing.
SQL Server 2019
This is a larger piece of my code.
Edit: Revised code for clarification, added output.
CREATE TABLE #record_changes (
[id] int,
[cID] varchar(255),
[fname] varchar(255),
[newVal] varchar(255)
);
INSERT INTO #record_changes VALUES
(1, '00001', 'first_name', 'Sean'),
(2, '00001', 'city', 'Columbus'),
(3, '00001', 'state', 'OH'),
(5, '00604', 'address_1', '123 Acme St'),
(6, '00811', 'address_1', 'PO Box 1234'),
(12,'00074', 'first_name', 'John'),
(13,'00074', 'last_name', 'Doe');
DECLARE
#max int = 0, #cnt int = 1,
#cid varchar(25), #fname varchar(255), #newval varchar(255),
#table varchar(255), #sql nvarchar(max);
SET #table = '[custdat]';
SELECT #max = MAX([id]) FROM #record_changes;
PRINT #table;
PRINT #max;
WHILE (#cnt <= #max)
BEGIN
SELECT
#cid = [cID],
#fname = [fName],
#newval = [newVal]
FROM #record_changes
WHERE [id] = #cnt
PRINT #cnt
PRINT 'cID: ' + #cid
PRINT 'fName: ' + #fname
PRINT 'newVal: ' + #newval
PRINT 'RowCount: ' + CAST( ##ROWCOUNT as varchar(10) )
IF ##ROWCOUNT > 0
BEGIN
SET #sql = 'UPDATE ' + #table + ' SET [' + #fname + '] = ''' + #newval + ''' WHERE [CustomerID] = ''' + #cid + ''''
PRINT #sql
END
SET #cid = ''
SET #fname = ''
SET #newval = ''
SET #cnt = #cnt + 1
END
Here is the results of the above bit of code. Note that RowCount is 0, but it prints the variables, so we know the query was successful.
[custdat]
13
1
cID: 00001
fName: first_name
newVal: Sean
RowCount: 0
2
cID: 00001
fName: city
newVal: Columbus
RowCount: 0
3
cID: 00001
fName: state
newVal: OH
RowCount: 0
4
cID:
fName:
newVal:
RowCount: 0
5
cID: 00604
fName: address_1
newVal: 123 Acme St
RowCount: 0
6
cID: 00811
fName: address_1
newVal: PO Box 1234
RowCount: 0
7
cID:
fName:
newVal:
RowCount: 0
8
cID:
fName:
newVal:
RowCount: 0
9
cID:
fName:
newVal:
RowCount: 0
10
cID:
fName:
newVal:
RowCount: 0
11
cID:
fName:
newVal:
RowCount: 0
12
cID: 00074
fName: first_name
newVal: John
RowCount: 0
13
cID: 00074
fName: last_name
newVal: Doe
RowCount: 0
Since it is not actually returning any results ##ROWCOUNT = 0, so it doesn't work for my IF statement. I also tried
IF EXISTS( SELECT #cid = [cID]... ) but that didn't work either.